Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a42351f7a98055…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 23:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9b4367db6a9115f4edfca21b31ec8ad SHA-1: 3659d402d433a0c03d162f27ea3baae13ade8804 SHA-256: 67a42351f7a98055d79b416a884a067fa0e65e825ec6f340d29e23946a181c0d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link redirects to known malicious infrastructure at ttraff.ru. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise the malicious link within seemingly educational content. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful sites.

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=autotrophic+and+heterotrophic+nutrition+pdf
    • http://vudupumow.nalsofgs.org/uploads/1/3/0/7/130738836/043fa3cc676b.pdf
    • http://files.bellinfischer.de/uploads/1/3/1/1/131164479/seboja-dovowixadalil.pdf
    • http://files.eurothreadlift.com/uploads/1/3/0/8/130874295/5135088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3087/0173/files/zatibax.pdf
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/wiwelidaziruxonomelagure.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/23241522201.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/68229009301.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/fuxuwapuwidufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/jimez.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/lifefekakoruziban.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/65440909893.pdf
    • https://cdn.shopify.com/s/files/1/0449/8417/2712/files/brazilian_male_names.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/mizamanagovorezigoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/85436858185.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/linukinuvebosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/final_fantasy_7_rom.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_off000067b9.bin
4f040f71082ec5c39959295c4003a033e113350733f1ac306e5e23d2fd0eb411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B9 5020 bytes
font_01_sfnt_off000078ca.bin
4ed65e8803dc343d1df58f17377bac5a3781d4fa5101d9d01423173fc8231ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CA 9932 bytes

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