Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb379e4366d9423e…

MALICIOUS

PDF

41.5 KB Created: 2020-08-01 04:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e772e84c618406abdf2db971a93960f1 SHA-1: 6b804332bf36287540e431d3d522aa703d058a68 SHA-256: fb379e4366d9423e759b969bb9ba9a7e729668c4ae2c63f6fb94cd3fcb4ff2df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users. The primary redirector URL is https://ttraff.cc/pify?keyword=german+shepherd+training+books+pdf, which likely leads to malicious content. The document body, though heavily obfuscated, contains references to training books and the redirector URL, suggesting a social engineering lure. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=german+shepherd+training+books+pdf
    • http://files.earth-shine-llc.com/uploads/1/3/2/3/132303378/985532.pdf
    • http://files.mgilbeyphotography.com/uploads/1/3/2/6/132680962/3345912.pdf
    • http://files.delormehumidors.com/uploads/1/3/0/8/130813777/ef14883.pdf
    • http://files.flocrowcroft.co.uk/uploads/1/3/0/8/130814346/11e77c7.pdf
    • http://files.dormantgypsy.com/uploads/1/3/1/1/131163667/dasedugotud-kukatef.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/megawabulemi.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/73103308271.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1333/files/amy_poehler_book_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8015/4269/files/kofupamov.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/46933463268.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/pifosukisuduf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0596/8537/files/vepit.pdf
    • https://cdn.shopify.com/s/files/1/0435/1361/0392/files/31104495637.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wojifuxazax.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/sareloponoxizafitep.pdf
    • https://cdn.shopify.com/s/files/1/0431/0951/5413/files/felumuposanovimunure.pdf
    • https://cdn.shopify.com/s/files/1/0436/1201/2701/files/fixubimowovubase.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9430/files/49421884078.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9782/files/revert_last_commit_github.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_off00006491.bin
480f419198e0864808744e319d2b6a00762864f14a5da89177413b49ccc6961f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6491 5656 bytes
font_01_sfnt_off0000779c.bin
08d78ac4257d292971f0b18afa6f7f54af2fb28aec305e2ed10844d06e99498b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779C 9716 bytes

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