Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff605ce73f40b05…

MALICIOUS

PDF

45.0 KB Created: 2020-07-31 06:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca66d67196176d16fa31c33bca683dbd SHA-1: d1a5fdab7c750a5cf9053e505031d5aa4edc2f6e SHA-256: 6ff605ce73f40b056c010eaeae2ae1ea108118ea5905df5b190c0932736c762b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, and one specifically redirects to a known malicious domain. The document body is heavily obfuscated, but the presence of the malicious redirector and the link farm heuristic strongly suggest an attempt to direct users to malicious infrastructure. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

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=alcatel+mw40v+manual+pdf
    • http://files.science.shenfieldlearning.com/uploads/1/3/0/7/130775902/xikikugilosudab_buzutuz_ganiwixiza.pdf
    • http://files.amityfarms.com/uploads/1/3/1/3/131380322/d5aeb85.pdf
    • http://files.ahsra.net/uploads/1/3/0/9/130969926/vazuruzisuweba.pdf
    • http://files.advanceprolighting.com/uploads/1/3/0/7/130739340/cc0d4ece039d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dojezurin.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/fozewawopobafer.pdf
    • https://cdn.shopify.com/s/files/1/0433/7729/5521/files/nejavuja.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/34215078898.pdf
    • https://cdn.shopify.com/s/files/1/0429/3568/1180/files/67834399670.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/dilojubudubo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/tivivepofokofimidar.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7645/files/bazepidujenejefogodut.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/kugiketajiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifezunelavezide.pdf
    • https://cdn.shopify.com/s/files/1/0434/7350/2361/files/potamonakupofiriladopi.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/7235821503.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/watibozinuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.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_off000072f5.bin
18f2e869768ffc997ecc11be1cb89e2bcf96acebb797c521d2261d7a40be18df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F5 5124 bytes
font_01_sfnt_off00008466.bin
7cf576f82516f17d545e68af61898b517aacc7603f9a8f0d188da802bb19bcb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8466 10012 bytes

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