Malicious PDF — malware analysis report

Static analysis result for SHA-256 7866b0416176eaf8…

MALICIOUS

PDF

54.2 KB Created: 2020-08-03 19:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28cbcbbd0e173b5e1ccd3ec673eaa97d SHA-1: aaa39ddaf4f39152a74cdecb3a94233f01039e25 SHA-256: 7866b0416176eaf8bef9979bdb04521538a244f877bf8c9d4eb7748669dbbb24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to potentially malicious content, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=english+grammar+rules+pdf+free+download, suggesting a lure for users seeking free grammar resources. The ML classifier also 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=english+grammar+rules+pdf+free+download
    • http://files.pghfestival.com/uploads/1/3/1/4/131437873/8168401.pdf
    • http://files.handstampedbycheryl.com/uploads/1/3/0/9/130969190/991e85d413f90.pdf
    • http://files.proteus-mrighifu.net/uploads/1/3/0/8/130813859/dobaxebotukanekok.pdf
    • http://files.mammaonline.co.uk/uploads/1/3/0/7/130775762/7080620.pdf
    • http://files.jessicacreane.com/uploads/1/3/2/7/132711970/dider.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/9760/2713/files/49966605573.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/6553876024.pdf
    • https://cdn.shopify.com/s/files/1/0428/5287/6455/files/92361527303.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/sifikejupaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/82074064596.pdf
    • https://cdn.shopify.com/s/files/1/0430/6521/3089/files/zokogevove.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/39780443592.pdf
    • https://cdn.shopify.com/s/files/1/0433/5910/9279/files/fedosuzejoxetemek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53975554289.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/togiwamodukopazave.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/ginupoju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000887c.bin
7b05f503d7db3019f2a78221c69d942926b48b8a6cb6845aba02518247674cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887C 5304 bytes
font_01_sfnt_off00009a5d.bin
78c6ac2375ea48a42cdaa491296b500299db4780ad0c8afec593525fe817036d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A5D 10260 bytes
font_02_sfnt_off0000bd50.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD50 4324 bytes

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