Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c5bab402dffe31…

MALICIOUS

PDF

39.2 KB Created: 2020-08-21 21:40:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea644f5e6b3e7b9dc6e9b499eb9886e3 SHA-1: 415e8cdc5248862a4cecfea21e58f729b1399ad5 SHA-256: 74c5bab402dffe31574daf2b9391e63ae173f003f692b8baaa5f3f8230488c2e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for a PDF related to 'behavioral neuroscience'. The presence of many external links suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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=discovering+behavioral+neuroscience+4th+edition+pdf
    • http://files.francescobaroneguitarstudio.com/uploads/1/3/2/6/132695519/f31434023cc8.pdf
    • http://vakonow.doublejoutfittersny.com/uploads/1/3/1/6/131606271/2717341.pdf
    • http://files.unrefined29.com/uploads/1/3/0/8/130813972/tejajeduvim_manugiwovenoxaw_kesojivuxafiv_wopijo.pdf
    • http://files.french-australian-lawyers.com/uploads/1/3/1/0/131070920/5a1285dfa23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/virananukolebawazinidid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://cdn.shopify.com/s/files/1/0430/8828/1761/files/affixes_in_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0428/3750/8252/files/rains_of_castamere_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/sixef.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/calm_breathing_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/wedusodarasewodujapi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4642/1158/files/17630424632.pdf
    • https://cdn.shopify.com/s/files/1/0437/8250/4600/files/present_tenses_exercises_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0429/2083/7287/files/probability_distribution_of_discrete_and_continuous_random_variables.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/91800866049.pdf
    • https://cdn.shopify.com/s/files/1/0445/4989/8399/files/holt_algebra_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/jatumeza.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_off00005207.bin
5e3f4b22401aaada54377f7e66e66495d97b0265a8fc1e4650348b29fc8179db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5207 5704 bytes
font_01_sfnt_off00006572.bin
e7592caad0710d13cf7739b96b902aaa6f90da1b4c08da3621986fd2b3e488b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6572 12980 bytes

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