Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d21dd10ed94e0a…

MALICIOUS

PDF

42.5 KB Created: 2020-08-18 20:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7191f430df826c794bf574a90b826be1 SHA-1: 349b6dc1fb639803cb3fb01ac0546d28389acb7e SHA-256: 79d21dd10ed94e0a2f777b6a6df3a7bb8324996ff506ee2f3c0682e0194bf055
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which are part of a link farm, a common SEO manipulation tactic. One of these URLs, 'https://ttraff.ru/pify?keyword=full+body+fly+sheet+horse', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links and the malicious redirector suggest an attempt to lure users to malicious sites or manipulate search engine results.

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=full+body+fly+sheet+horse
    • http://files.whereintheworldiscaseykey.com/uploads/1/3/0/7/130738504/seloko-tomag-vajemisejinal.pdf
    • http://sasakix.jesusourredeemerlc.org/uploads/1/3/1/1/131164250/48980acef5010c.pdf
    • http://files.jamaicavibez.com/uploads/1/3/2/8/132814050/7ced903a55da63.pdf
    • http://jakenewe.piecemakersquiltshop.com/uploads/1/3/1/6/131636725/zubefokenalizomip.pdf
    • http://files.yarmouthportlibrary.org/uploads/1/3/0/7/130776602/wizizomedib-sugodafafu-befakaragev-dikomapevomek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2807/9004/files/qaseeda_burda_shareef_full.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/23273989455.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7069/files/17_note_kalimba_songs.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/mahatma_gandhi_biography.pdf
    • https://cdn.shopify.com/s/files/1/0440/7492/6230/files/ielts_speaking_questions_part_1_2_3.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/6246342352.pdf
    • https://cdn.shopify.com/s/files/1/0433/3957/9546/files/rexixilibuvaxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/6086/9785/files/fakemo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5231/7342/files/ata_chapters_complete_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/3653/2136/files/45899755405.pdf
    • https://cdn.shopify.com/s/files/1/0437/0890/7688/files/buffalo_wild_wings_to_go_menu.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_off00006b43.bin
de6c62acaf25ec4bde407391d6a2e4232bb5d190b1c0069fbb8cfc2f8b07e654		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B43 4984 bytes
font_01_sfnt_off00007c30.bin
85966958113b6b45905b1ef7c04fa7ae999a9f94930956aa34f50a620d750b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C30 9752 bytes

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