Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6939255886bceb5…

MALICIOUS

PDF

51.4 KB Created: 2020-07-28 23:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27188eceac1597caf5426188d1b4eb11 SHA-1: 13e29660c486703a1623c1c09aa32aab90b79322 SHA-256: a6939255886bceb55b36b696b258c038e078ea41ccd31e8d4c7fb66adcbebe36
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a manual for a Blade 230s helicopter. The document also features a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farm abuse. The ML classifier strongly indicates maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the primary intent appears to be redirecting users to malicious content.

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=blade+230s+bnf+manual
    • http://files.familyloilty.com/uploads/1/3/0/7/130776130/dowasigunafet.pdf
    • http://files.ywcahealthandfitness.org/uploads/1/3/0/7/130775380/66803ea831d73f.pdf
    • http://files.hardloxjewishfestival.org/uploads/1/3/1/4/131437246/dunetebati.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/gixolen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/84915341337.pdf
    • https://cdn.shopify.com/s/files/1/0432/5366/1851/files/84966406178.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5804/files/40967644683.pdf
    • https://cdn.shopify.com/s/files/1/0430/6580/2905/files/zuduzuzopanuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/92030493692.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0437/2761/8209/files/kaniteg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rikakaxudote.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/88252219562.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/13030008565.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/gebavuruwofaxanupaxiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/lokosabugadozefila.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_off0000890f.bin
292ae6f8784561831b76453197a6717982d74a133ecc101deb4bfe4a7eb68b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890F 5228 bytes
font_01_sfnt_off00009aac.bin
43b8b69ebc15c7df46b0fddfed04999f29e71a69bea64529aa34862502d3d3ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAC 10804 bytes

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