Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d15c687c5218f45…

MALICIOUS

PDF

56.7 KB Created: 2020-10-25 20:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e1cf5df12a0105ca492055616ad5069e SHA-1: 174ba965cb1fb38869a22941e1350b951f3e9e5f SHA-256: 8d15c687c5218f45d4d5dce1c939890d628947018204ee87e52a93843e8f340d
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'https://cctraff.ru/strik?keyword=serie+crossfire+livro+1'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=serie+crossfire+livro+1 In PDF document text
    • https://murikupa.weebly.com/uploads/1/3/4/4/134481598/8675292.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/davuseguxiv.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/vafepanupe.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/filamovebitojiloxevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f86faf6c864c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f8702d6e9ce5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5f9064ce9b100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f92736fcbbe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5f8e09b8640f3.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/1/0484/4109/8398/files/rogulaxawisizumuvaligidij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/4635/5103/files/50154332819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7957/4717/files/vivusewaxujopojagavajog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2576/3989/files/surah_al_waqia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1344/7584/files/cyberghost_premium_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3897/3345/files/fepefelijume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0cd8e33-7d24-44c8-a60a-18eb829284b8/70672818410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59cd6256-5c91-4c79-92b0-f6c1f8b4badf/43289801076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e75973-f352-484b-a9af-abe02345c738/57525066439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb808def-4c28-494f-84d3-616e32207a7b/rizamokewevikezosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f942de-6cc3-4885-85fe-835d8ab4ef07/bugoxoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/2876/6630/files/the_devotion_of_suspect_x_novel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2844/7900/files/types_of_chromosomal_disorders.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3B2 4880 bytes
SHA-256: aff3cb3ecd5659e99dbee8e021ce9177c1ddf12eed3833c2900c329709ef0328
font_01_sfnt_off0000b463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 9656 bytes
SHA-256: d1b3b0ed651ef0b63bc8f493f4f0b93e07bbac85145ebfdcbd38e89557fb576f

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