Malicious PDF — malware analysis report

Static analysis result for SHA-256 872a7103cf86e8de…

MALICIOUS

PDF

40.9 KB Created: 2020-08-01 01:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b09af4f3dc0c7e7f92054479147c8fb SHA-1: 1e168110c5af5978f575d8d37686898606bced03 SHA-256: 872a7103cf86e8de94b380a94a1e94eba18415cecadd4662e5833c26283d5883
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to external PDF files hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious objective. The document body, though heavily obfuscated, contains the same suspicious URL and references to 'texture packs', likely a lure to encourage clicks.

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=1.+6.+4+texture+packs
    • http://files.twin-city.org/uploads/1/3/1/3/131384401/eaafaec716ad47a.pdf
    • http://files.c3industriesllc.com/uploads/1/3/0/7/130776726/xufadujedus.pdf
    • http://files.woodcraftbybean.com/uploads/1/3/2/6/132696128/f9446121f.pdf
    • http://files.usczbusinessforum.com/uploads/1/3/0/8/130874544/fcf36178392.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1927/9259/files/4798091974.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/55624707314.pdf
    • https://cdn.shopify.com/s/files/1/0435/6633/4111/files/kopagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1316/8542/files/20583826940.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/64046984649.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/jibozogef.pdf
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/kovajuleki.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/87493624523.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/95117280251.pdf
    • https://cdn.shopify.com/s/files/1/0431/8003/2160/files/gavobojorekimojaxegawi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/wunupivegi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/vuvafipen.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/mimujuxolutu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/58620093933.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9368/files/wumapana.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_off00005913.bin
f33de7086da53ced6964651cf2774327bd271bf1711bd2cd275d75b64ea0f36b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5913 5260 bytes
font_01_sfnt_off00006b14.bin
315ba5c238c337cc3c62ea6ea92a7087e4782cdca3c94cc44b5c38299eff2a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B14 13824 bytes

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