Malicious PDF — malware analysis report

Static analysis result for SHA-256 91562def3ab6eb00…

MALICIOUS

PDF

33.9 KB Created: 2020-08-12 14:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 199e3e8bac2d3f72dbdff97adb1fcd6c SHA-1: 27665da3d0ec1306db4cf3c96c1fe10dca3b1455 SHA-256: 91562def3ab6eb00df81c7c27be09074e74ab824ae22bfa6ecd81f2bcc0a7faa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=cardiopulmonary+bypass+principles+and+practice+pdf'. The document body also contains this URL and other PDF links, suggesting a link farm designed to lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=cardiopulmonary+bypass+principles+and+practice+pdf
    • http://wejuzu.construction-lines.com/uploads/1/3/0/8/130813030/lewugete.pdf
    • http://bemox.racial-inequality.com/uploads/1/3/0/8/130874493/kojefininulotu.pdf
    • http://files.nfatuated.com/uploads/1/3/0/8/130814245/3e7c06535.pdf
    • http://files.ghouliesmovies.com/uploads/1/3/1/3/131398250/602f26150.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zexula.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/64936358422.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/tunefon.pdf
    • https://cdn.shopify.com/s/files/1/0433/5560/3094/files/34186452143.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/fuwifozasuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5375/1189/files/leisure_suit_larry_reloaded_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/53286652168.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/jogezemobus.pdf
    • https://cdn.shopify.com/s/files/1/0438/3775/1453/files/zeborazekoxidaniwepurewog.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/generalized_anxiety_disorder_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/satellite_kevin_gates_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/6343/4654/files/vegirevopovadefetuviwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/64449861362.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_off00004798.bin
55b535f3b6f80e42c6e7efaccf59694dc5156c47de639f89ee2c63b0f888a784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4798 5448 bytes
font_01_sfnt_off00005a0a.bin
f4b3c6fac711c6a9460bc00294796e10648d0129ceff604b3176cfb6d3037669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0A 9488 bytes

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