Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1325a9bc5335fda…

MALICIOUS

PDF

67.6 KB Created: 2020-08-07 03:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d903220f095cba56c4d1691b85bf44b4 SHA-1: 2c54f2fd065036d40ce017c47c51615677d71a5d SHA-256: a1325a9bc5335fda37628f927fc0d50fefa2e07b9871f695426ff920b06c972d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=ethical+framework+for+the+counselling+professions+pdf'. This indicates a social engineering attempt to direct the user to malicious content. The presence of a large number of embedded external PDF links, many hosted on Shopify, further supports a link farm or SEO poisoning tactic. 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=ethical+framework+for+the+counselling+professions+pdf
    • http://files.leechristinebrownlee.com/uploads/1/3/1/3/131398385/wefodanemom-bixup.pdf
    • http://files.throughmonstrouseyes.com/uploads/1/3/0/7/130775740/wavub.pdf
    • http://files.authortalk.audio/uploads/1/3/0/8/130814157/3d8e4a12a5f2.pdf
    • http://files.centraloregonfillyourpantry.com/uploads/1/3/2/6/132681352/nefadosuborosa.pdf
    • http://files.1848concordschool.org/uploads/1/3/1/8/131857914/9990256.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/litutal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/20715508474.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/99964170599.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/pdf_hematology_basic_principles_and_practice.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/kesifuvudosab.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/75515777040.pdf
    • https://cdn.shopify.com/s/files/1/0434/7677/9174/files/xafiguladogufikoderoxage.pdf
    • https://cdn.shopify.com/s/files/1/0440/6503/0309/files/woretemozi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/27790540468.pdf
    • https://cdn.shopify.com/s/files/1/0432/9340/9438/files/wigozapaxujenidaxuwadoma.pdf
    • https://cdn.shopify.com/s/files/1/0432/1958/3138/files/topidesu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/43080980621.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/tatelezugetiduxutu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/ferraillage_dalle_pleine_bton_arm.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf8.bin
1e268fdc3af630ae1feaa5eadbba873c8494af02dde060535bf46790f424c2e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 5680 bytes
font_01_sfnt_off0000de3a.bin
5d1d9abc65d044baa9496a11f4cf59b4db5a6ac5882a30ec33339b4710587afb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 9964 bytes

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