Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e6561b0fbcdba1…

MALICIOUS

PDF

38.3 KB Created: 2020-08-25 17:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7263295d3ec979e70bac5b4052c1f25 SHA-1: 51e192cafdf0a3dee64853128f1ec4c00107cf25 SHA-256: 72e6561b0fbcdba1ac597a9ad0429b72616ef535a38f5c76bc093d4c07a2588b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to drive traffic to potentially malicious or scam-related content. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.ru/pify?keyword=list+all+worksheets+in+a+workbook+excel
    • http://mepor.sunspanish.com/uploads/1/3/1/6/131606289/3381811.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4317/7126/files/segapakafabelezu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/xadonugaxe.pdf
    • https://cdn.shopify.com/s/files/1/0460/6502/5179/files/gcse_chemistry_equations_list.pdf
    • https://cdn.shopify.com/s/files/1/0459/7055/5047/files/vuboparipafugimakerizika.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/6457246147.pdf
    • https://cdn.shopify.com/s/files/1/0450/6094/8118/files/agriculture_in_sub_saharan_africa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2612/files/causative_verbs_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6665/files/how_to_solve_mirror_cube.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b08.bin
891fba49401f851f5f13713e59d6b86a135fba2408be4452418475b4434e0aba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B08 5192 bytes
font_01_sfnt_off00006cbb.bin
f97292ebdd40f7770844870ac743faa1cca54b5191c5abe0b64466d8bd30e916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBB 9320 bytes

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