Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8f0cb9273a0c3f…

MALICIOUS

PDF

44.8 KB Created: 2020-08-18 22:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d39139c52e918af6d997985258e9cf7c SHA-1: 3492c12880bf8ffbefc85a47e7a7b25c2d44a1f0 SHA-256: 0a8f0cb9273a0c3ff19209531c127c80a9e92065f7bd9675db1af84720efaab0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body also contains this URL, suggesting an attempt to trick users into clicking it. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious destination or for SEO manipulation. No scripts were extracted, but the embedded URL and link farm heuristics strongly suggest a phishing or malware distribution attempt.

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.com/pify?keyword=dative+latin+worksheet
    • http://nigegiw.esspreespringers.com/uploads/1/3/0/7/130776046/4280654.pdf
    • http://kafowoxak.beardsleyzoo.org/uploads/1/3/1/4/131406717/1a154f15.pdf
    • http://files.msimone.com/uploads/1/3/1/0/131070212/3565284.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/go_to_sleep_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3112/files/26888656497.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2324/files/basic_english_grammar_book_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0525/files/oxford_albanian_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/negumelomesisexiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1077/6478/files/free_illustrator_t_shirt_templates.pdf
    • https://cdn.shopify.com/s/files/1/0432/2924/9694/files/alteraciones_geneticas_cromosomicas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/pdf_pendidikan_agama_islam_kelas_x_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/44464483362.pdf
    • https://cdn.shopify.com/s/files/1/0437/5438/9665/files/65421888918.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/60472260946.pdf
    • https://cdn.shopify.com/s/files/1/0431/7144/6939/files/tabovakupupumamodejasog.pdf
    • https://cdn.shopify.com/s/files/1/0429/4131/7276/files/xafanenuzitulajovivajemek.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_off000070a0.bin
ac7d8e4a78c73e6cab0f89cea4b08982bc331fa10421c0b90c6a6b3a05c45b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A0 4988 bytes
font_01_sfnt_off000081a7.bin
5b33bd7a728a611e22061796523c694c5a937aa7487698af4f7f8e5e15f9bfec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A7 10820 bytes

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