Malicious PDF — malware analysis report

Static analysis result for SHA-256 91136ffd3dee344a…

MALICIOUS

PDF

38.8 KB Created: 2020-08-25 00:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e406796ee25b1a8342685ba1af2ca960 SHA-1: 3ab24c935697f84064aa47f9bf7e5966bdac18aa SHA-256: 91136ffd3dee344a10ff09082ffe119baded48d39e99d8f6b24af7a88c70dbee
154 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 pointing to 'ttraff.com'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be luring the user to click the malicious link, likely leading to further compromise.

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.com/pify?keyword=pdf+file++site
    • http://files.tasteofhomeswansea.co.uk/uploads/1/3/1/4/131453267/1e6da71.pdf
    • http://vorajeza.2bkmc.com/uploads/1/3/2/3/132303168/fuvimezatutarep_ratuli.pdf
    • http://fatazid.anytimeautoparts.ca/uploads/1/3/2/7/132740515/bbfdd906d4c.pdf
    • http://teduxide.upstatevegan.com/uploads/1/3/1/3/131381046/xesovexisajix_paxez_tatuwakuji_dikejavavivef.pdf
    • http://files.lemroyaltyfreemusic.info/uploads/1/3/1/1/131164117/jadodibolitotaja.pdf
    • https://cdn.shopify.com/s/files/1/0449/7837/2766/files/51638967787.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/zimegogorawelusowar.pdf
    • https://cdn.shopify.com/s/files/1/0429/3938/3971/files/kingdom_hearts_2_final_mix_differences.pdf
    • https://cdn.shopify.com/s/files/1/0432/3636/0351/files/memomasagemukisetafekuve.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/fuwipuveno.pdf
    • https://cdn.shopify.com/s/files/1/0439/4965/4184/files/assembler_en_ligne_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/46138990035.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/32940781822.pdf
    • https://cdn.shopify.com/s/files/1/0434/1802/6142/files/answers_of_reading_practice_test_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/32806512953.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_off00005dd1.bin
1ef1d139cd6a8ada28348b1c2fd22f4b188e3c2a2332434fa7104da22ccbcb46
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD1 4596 bytes
font_01_sfnt_off00006d86.bin
e16763cf2a643e912e2ea341e2593f340753fe103a5a229ed76e62eac6d1bada
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D86 9840 bytes