Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b5c5a99b7d2d6f…

MALICIOUS

PDF

53.2 KB Created: 2020-08-24 13:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bcb8fc12cc3a783234faf5f52fbfbb1 SHA-1: e7bb3710d236a758da2cc4741e154a8b255efe35 SHA-256: d9b5c5a99b7d2d6f381baafe3a583d029b4169017887f02cbff19e993b0a632b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of malicious redirector links and a large number of external links suggests a phishing or malware distribution attempt.

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=crawmerax+solo+guide
    • http://files.actingcoachlasvegas.com/uploads/1/3/2/6/132681566/lejele.pdf
    • http://fesimod.untdnatives.com/uploads/1/3/2/6/132682076/xevum.pdf
    • http://xedupure.jsnobles.com/uploads/1/3/1/6/131606289/cbc6a3a5267.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/gufafiraturekofapulijef.pdf
    • https://cdn.shopify.com/s/files/1/0434/3880/1061/files/bunerogodoxosip.pdf
    • https://cdn.shopify.com/s/files/1/0438/4774/5698/files/pixie_where_is_my_mind_piano.pdf
    • https://cdn.shopify.com/s/files/1/0439/7550/8126/files/brkert_6014.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6088/files/xotarikopasojiwasele.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3589/files/86214537192.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/bepuvudo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/unix_basics_commands_with_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4427/files/banana_boat_song_trumpet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/6912/9372/files/bahnwrter_thiel_zusammenfassung.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/12876987891.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_off00009374.bin
ccca962efbc22c710ef0a584c7d775792a1938050e840a236c8baf90841986a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9374 5212 bytes
font_01_sfnt_off0000a527.bin
cb60f8a1393f6e48f844ba465447192f0414449f5152d64bf8e1a700883ccb06
pdf-font-stream PDF embedded font (sfnt) at offset 0xA527 10376 bytes