Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c790d86cae2d1bc…

MALICIOUS

PDF

42.0 KB Created: 2020-08-18 17:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c4c5684756cac818c1572ff07602892 SHA-1: 4945bf089df211adabcaef922fc75e4855aa4837 SHA-256: 6c790d86cae2d1bcc94e5c541a36b6426cc19dedda80dc704913c2fced97e408
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.ru/pify?keyword=bunco+score+sheets+3+rounds', which is flagged as malicious. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes.

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=bunco+score+sheets+3+rounds
    • http://files.avriltahoe.com/uploads/1/3/1/1/131164476/372d5134135.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/juxoxizibasebesoni.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/terotufuwogaririnir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3135/5807/files/serusugixi.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/data_abstraction_and_problem_solving_with_c_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/74943190807.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/mehrsa_baradaran_the_color_of_money.pdf
    • https://cdn.shopify.com/s/files/1/0429/2375/3635/files/tefonodesigodilukalowiliv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofoxi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ae5.bin
af40faa7ed64f0fb9a9ff496c31d720f15294ea749157dc71cf2bb19007aeec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE5 4832 bytes
font_01_sfnt_off00006b38.bin
e5a4539efb2dda2fa9b29fbf32a58ec0074ae3c608e634c3aa56d16e25ace275
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B38 9956 bytes
font_02_sfnt_off00008d5b.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5B 4324 bytes