Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43631c0c28e76d4…

MALICIOUS

PDF

49.7 KB Created: 2020-10-16 07:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fdcdc012261a0be1b32dc6ed3368cb70 SHA-1: 9e1f215cb787c181022e7119cc7a67f25c05e3b8 SHA-256: b43631c0c28e76d48248ea5292404899421cd4f5ed884f89d605e85c50c41962
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL containing 'plague+inc+scenario+creator+apk+indir'. The document body also contains this lure text and numerous other links pointing to disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=plague+inc+scenario+creator+apk+indir In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f88f75334ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5f87af836dec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f873f3081803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f876b62a1906.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/9507096.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/0b698.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/431471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8705a050e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f88c0cb76f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f8711beb747e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8754865d401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f8901a5406dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f883a83c5ef2.pdfIn PDF document text
    • https://site-1043696.mozfiles.com/files/1043696/lavofasojejobokagajij.pdfIn PDF document text
    • https://site-1041183.mozfiles.com/files/1041183/nejurapetekewupag.pdfIn PDF document text
    • https://site-1043764.mozfiles.com/files/1043764/6082743245.pdfIn PDF document text
    • https://site-1040084.mozfiles.com/files/1040084/magimizoperidijopebelijot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8534/1876/files/43674263556.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8373/6243/files/6_ton_jack_stands_made_in_usa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/alto_en_ingles_medidas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/authors_tone_and_mood_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9369/7721/files/pakonixawomulababu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 2880 bytes
SHA-256: 5f03d2c6bc08d28d18892b3fd5153044a2fff6aad81dd629dfd07635bf6cf50e
font_01_sfnt_off00006ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE3 5304 bytes
SHA-256: 1e6c5295a9b71f3f224bed6cdcfb3fe810403d286c418456d0c873aea738707d
font_02_sfnt_off000080f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F8 10192 bytes
SHA-256: 56afc0e59574e081e94a10deae36bba9b832a86d935b1e51dafc3d6cd8d40946
font_03_sfnt_off0000a408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA408 16060 bytes
SHA-256: d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72

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