Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c67815e4cb1775f…

MALICIOUS

PDF

39.5 KB Created: 2020-09-17 00:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01629660e0fe77a647c4416ac5226cb5 SHA-1: 0cc44fc11090ca3139073e29015f8ff8cdc8f4a9 SHA-256: 7c67815e4cb1775fcf6800b75bc4f7f6e101312a0f1c189157b5d7ad6f52fea4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious sites. The document also functions as a link farm, containing numerous links to other PDFs hosted on disposable domains, indicating a probable phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=nighthawk+x4s+mesh+extender
    • http://files.increaseus.com/uploads/1/3/1/4/131407572/52d933e82.pdf
    • http://files.pasofoodcooperative.com/uploads/1/3/2/3/132303351/7079650.pdf
    • http://files.stpaulautomation.net/uploads/1/3/0/7/130739835/jigenajoribipixef.pdf
    • http://xeleku.spencecatermusic.com/uploads/1/3/1/3/131378970/cf2dd4a44.pdf
    • http://jopik.allthingsnewvizslas.com/uploads/1/3/0/7/130739393/5442216.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1c589787-3198-4d78-8fd0-a9967769f3fd.filesusr.com/ugd/6f53d7_3d0a2b595c8f481d95e754050a8ad033.pdf?index=true
    • https://0fe8cd92-159d-4d3d-a869-523a1b8f4fa2.filesusr.com/ugd/cb0188_d559921a88c44a9ca0031c3db3a1388c.pdf?index=true
    • https://8147ce18-b5a2-4da1-acde-acae8406dede.filesusr.com/ugd/58a813_d4dc4ca0a3c54faf8ce330b15d344de0.pdf?index=true
    • https://35f5ef91-6426-4ff4-bd04-5323259c1357.filesusr.com/ugd/4e977a_f53aac5ba85f41a39572819d2be2286c.pdf?index=true
    • https://91bf7076-212a-4a58-9c49-a05828cb3feb.filesusr.com/ugd/4bb894_cd5ff454b08c4502bd52e439f85397a3.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0436/3619/5488/files/madeliridej.pdf
    • https://cdn.shopify.com/s/files/1/0438/4689/3730/files/xobafenupixubenaxijerow.pdf
    • https://cdn.shopify.com/s/files/1/0435/2140/9184/files/happy_anniversary_audio_song_free.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b44.bin
86596c26c4ce4d2d80891513df5f7c57213c9f9cd684de531b3a29bd5951e91a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B44 5488 bytes
font_01_sfnt_off00006de9.bin
33508b6fc26a033be893c57d7f88e073bc167ff2655798e77b89408c8b88b52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE9 10408 bytes

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