Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fac68beb406921…

MALICIOUS

PDF

40.6 KB Created: 2020-08-14 13:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8cecfff595ef2f3aff25dfc843298c1 SHA-1: 7b116346b5200a6b28f09ae01401bf99e61a7d63 SHA-256: 61fac68beb40692155b657b8c0e132d406502456c823d23c31c24187c492e3e8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting a lure for a 'field manual PDF free'. The presence of many external links, including a large number of PDF links, indicates a link farm or SEO spamming attempt, likely to drive traffic to malicious sites. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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.com/wb?keyword=discipline%20equals%20freedom%20field%20manual%20pdf%20free
    • http://files.ascinsurescaffoldtoolbox.com/uploads/1/3/1/4/131406437/rowimijedopef.pdf
    • http://files.photographybycarrie.co.uk/uploads/1/3/0/8/130874240/kuxefelironixuda.pdf
    • http://files.bywayfinearts.com/uploads/1/3/0/7/130776255/lifadez.pdf
    • http://files.timbercovetrails.org/uploads/1/3/1/3/131384713/fepevisiwexut.pdf
    • http://files.cherokeerosehandcraftedsoaps.com/uploads/1/3/2/6/132695575/666836.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8430/0959/files/89518710012.pdf
    • https://cdn.shopify.com/s/files/1/0433/8676/5475/files/fukosalonuvemiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0278/1083/files/96472960816.pdf
    • https://cdn.shopify.com/s/files/1/0437/5147/3301/files/kulaliwerumedokuvizod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26433336276.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/61283458413.pdf
    • https://cdn.shopify.com/s/files/1/0437/6949/5710/files/jiwalodu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8339/8310/files/23570764028.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/adobe_illustrator_book_khmer.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/vuzajewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemopijudesukofareran.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_off00005ed5.bin
889364d267debb200d6d93a859b0ebe9f9cf202b25f6f2674251cc61b3c24ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED5 5428 bytes
font_01_sfnt_off0000712a.bin
cdbd39643b230b3d3e99211cc3017b22550de416dfdd33cb0533a741027ca179		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712A 10708 bytes

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