Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa13af36a06ddf9…

MALICIOUS

PDF

79.4 KB Created: 2020-10-28 20:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 971bc2d4c16cad2624c484e3bd69ab00 SHA-1: 31d2ed836b98ea2a6333d756be377aa695952f4c SHA-256: 3fa13af36a06ddf9428f0e0f81f883655a0899c3b0b74ba2d0d589a175c82e53
174 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links and a URL in the document body that point to known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests SEO poisoning to attract victims. The document body, though heavily obfuscated, contains a URL that is also listed as a high-risk IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=tp+link+re210+manual+greek In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_5f90b474408a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5f949b28ee9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5f900de01186c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f9475fd3f029.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/41686076895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1187/3189/files/13557719012.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/26670986982.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/80799752106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf7e82f-3cdf-4b4a-aecf-8d237c3122f3/roxazirevesolasuje.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/ew_kenyon_books_jesus_the_healer.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/84561951134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1022/7876/files/spongebob_memes_clean_fortnite.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/pekar.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/girizibinasije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98ce084-b0cf-47c2-8ba6-123b8b50d175/aprender_vocabulario_ingles_por_temas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5469/4039/files/13060515747.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/nuloperapezudurudi.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/20670228042.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/approaches_to_the_study_of_indian_politics.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/sowomikozaxad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 5300 bytes
SHA-256: ea07f7715fd69c12679a5d2274ac2434c2ea0cbb1e0125a2fa83dbc1b738c6b8
font_01_sfnt_off0000f1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10356 bytes
SHA-256: 828767e1dcf8ab4ec1c21e6db9d04b619fe367f437755369b7a9d5bd5be44e3e
font_02_sfnt_off00011528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 17812 bytes
SHA-256: f755c4ea0dce7c6fb4e67e5bada1a3876390762234d2106d854e0d2f2476c7ab

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