Malicious PDF — malware analysis report

Static analysis result for SHA-256 793fab867efa4cd1…

MALICIOUS

PDF

90.2 KB Created: 2020-08-13 00:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16444fbd18fd1168beb64690a5b926b SHA-1: 1e90b76a4fb99220fe494496985e3a634ce949b9 SHA-256: 793fab867efa4cd1ac4a0694bb783e363d09728a803617cda51516a2c98a3f6d
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for opening a Barclays bank account, directing the user to the malicious URL. The presence of numerous external PDF links suggests a link farm SEO tactic to obscure the malicious redirector.

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=barclays+bank+account+opening+form+pdf
    • http://files.moragheilish.com/uploads/1/3/1/4/131407734/2340222.pdf
    • http://files.nashandcothreads.com/uploads/1/3/0/8/130813301/a8807bc684.pdf
    • http://files.karoobirdingsafaris.com/uploads/1/3/1/8/131871572/233469.pdf
    • http://files.basicbeautybyvittoria.com/uploads/1/3/2/3/132303312/nurekomamosa.pdf
    • http://pukexanij.tinyfires.com/uploads/1/3/2/6/132681556/tavamerebuso.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9600/7065/files/biochar_review.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4277/files/25977787261.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/halo_effect_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/fefim.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/bohr_sommerfeld_theory_of_hydrogen_atom.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/1695590025.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/7850488731.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/november_2020_calendar_with_holidays.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/lovowofupejosazamepagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/zivanisedam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8837/1107/files/xagesiloxujujofanaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/8748/7385/files/mistweaver_monk_icy_veins.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fc1.bin
ab6202885be6b27694907c909dfdab05970b4a226f120b45fb13b00a9e9eb7e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 2008 bytes
font_01_sfnt_off0001192e.bin
76e369d8b1d24063e701d40a017203bff2f10d75cab4d0f3626479854381fe58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 5828 bytes
font_02_sfnt_off00012cf9.bin
b76cbfb262daa948ec012efa06cec611cf5308dc3660c6979b2f51cc4711e6ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 14580 bytes

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