Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2d7cb0d27fcf14…

MALICIOUS

PDF

54.9 KB Created: 2020-08-24 00:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cbb8716345c3c2ad1a6921d1269a857 SHA-1: d984fcfbf791085e5e70a6965540097ac2397ca4 SHA-256: 1a2d7cb0d27fcf1469cd7cee3b047376ec4c3592477d1bf41c08690134ab40fb
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination. The document body, though partially corrupted, contains the same topic as the malicious URL, suggesting a lure. The presence of numerous embedded links to PDF files hosted on Shopify, some of which are confirmed benign, indicates a potential attempt to blend malicious links with legitimate ones or to use legitimate platforms for hosting. The ML classifier 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=treatment+guidelines+for+necrotizing+fasciitis
    • http://nuzaxowa.hopefulplace.com/uploads/1/3/1/8/131871390/jumuteke-mesigezaz-gazesitag-xesojek.pdf
    • http://files.reeftheband.com/uploads/1/3/1/4/131453969/66901.pdf
    • http://files.taravigilphotography.com/uploads/1/3/1/4/131406270/d2ffc.pdf
    • http://vaxajun.trulymedium.com/uploads/1/3/2/3/132302921/7325384.pdf
    • http://tirupowek.wewalktogethercharlotte.org/uploads/1/3/1/3/131384609/xofowox-xikokemadokis-bolubafefimom-sanunegem.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/64351803890.pdf
    • https://cdn.shopify.com/s/files/1/0428/1643/8438/files/dijugikaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/5304/6165/files/74032686966.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6073/files/short_sword_texture_pack.pdf
    • https://cdn.shopify.com/s/files/1/0463/0895/0176/files/53647581802.pdf
    • https://cdn.shopify.com/s/files/1/0434/6360/6422/files/vupukefatizuzokoravirav.pdf
    • https://cdn.shopify.com/s/files/1/0433/8250/5637/files/35480251282.pdf
    • https://cdn.shopify.com/s/files/1/0434/6413/0725/files/delaware_river_fly_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zupapinited.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/kukri_knife_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/3404/9703/files/age_of_empires_2_mac_dmg.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/jugoritidixuzirifami.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_off00009971.bin
65809c5d0336129c38255c9cf465c3c58a8bd4763505f553cb1a41cf383a3234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9971 5340 bytes
font_01_sfnt_off0000ab87.bin
3712a66a4510d92dbb3da93ffa0cfeacca2e8696364ee916bdce72ae14c3a55a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB87 10312 bytes

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