Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec2b2c6e54153cf…

MALICIOUS

PDF

63.1 KB Created: 2020-08-11 08:39:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2ffdfb90ae04ff8d8b3cf2475e4466a SHA-1: d59cdac47109d1a985263fa74e94d9001b1dd1e4 SHA-256: dec2b2c6e54153cfaa0b1041374beb6beb988b04c7a1ab9cae619c963ecadd56
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a known malicious redirector (ttraff.ru). The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting it's the primary lure. The presence of a link farm heuristic further indicates an attempt to distribute malicious content.

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=divorce+in+islam+in+urdu+pdf
    • http://files.dreid5codes.com/uploads/1/3/1/0/131071129/bd52f.pdf
    • http://files.myroyalorganics.com/uploads/1/3/0/8/130814423/6335139.pdf
    • http://files.altalomabands.com/uploads/1/3/2/6/132695388/3616780.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/derivatives_markets_mcdonald_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/suket.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/civil_engineering_reference_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/0576/9888/files/8696774345.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/kiduzujideroruverolugi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/favubedezemopazejive.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0315/files/61961206798.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/gokirogot.pdf
    • https://cdn.shopify.com/s/files/1/0438/5321/7952/files/miguel_cervantes_don_quixote.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0678/files/abortus_pogi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9937/3214/files/zuwupoxabegadumovi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/alluvial_mining_methods.pdf
    • https://cdn.shopify.com/s/files/1/0432/0165/9043/files/english_arabic_mathematics_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/3952388438.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/
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/gok

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7af.bin
dcb3fe9d877d95a92e6254e71cabd2170250896e6cd1c1b681cc127fc4228aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7AF 5360 bytes
font_01_sfnt_off0000c9d8.bin
d2961e0347ce78d90276dc1558102aeb62fe68dc85c08b008a979d58bb53da78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D8 11788 bytes

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