Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7d32c591c76aa5…

MALICIOUS

PDF

34.3 KB Created: 2020-08-19 15:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09afd460a6b214693191ae0f85c0c88a SHA-1: 0a4894f02d58efc2a26f355925638435fa43b52b SHA-256: 5c7d32c591c76aa5c500e33abbbb520341a810382712cb38b3fbbeec6d781dc9
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 redirector service known for malicious activity. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

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=lexile+conversion+to+guided+reading
    • http://files.amychally.com/uploads/1/3/0/8/130874646/radakerovasejaz.pdf
    • http://bekonip.case.coach/uploads/1/3/0/8/130874592/2310142.pdf
    • http://files.freightrainsandhorses.com/uploads/1/3/1/3/131384401/gewoxixijap.pdf
    • http://pikaro.alexandrazellerarted.com/uploads/1/3/1/0/131070722/mugajane.pdf
    • http://begiga.zendenmissoula.com/uploads/1/3/0/7/130738970/begeginave-pimumurugif-bisimuf-tetasimake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/jawowabazakefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1030/files/64969678724.pdf
    • https://cdn.shopify.com/s/files/1/0444/0460/5094/files/paulo_coelho_alquimista.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/historia_derechos_humanos_unam.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/agricultural_marketing_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/61844097552.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/2059433222.pdf
    • https://cdn.shopify.com/s/files/1/0460/4008/8740/files/kivoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/90691792718.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/exotic_birds_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/29816922559.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/78225127539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/61522111635.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_off00004a1b.bin
ef8d9ad2f13db4736c6f3704b6e6206fad804680ad5ee7afdcf7d05472857101		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A1B 5176 bytes
font_01_sfnt_off00005bc2.bin
13f9b482a553e6bbfc906f52b051460dd43332cdfdc296f1b8fe51b80ffe5531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC2 9452 bytes

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