Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5a6dd38cdaae02…

MALICIOUS

PDF

38.6 KB Created: 2020-08-31 09:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb370c866a9cbe89d38cf2a4b3c1d8da SHA-1: 36d2fc0e4993733924cb9f42fa06c88cddb25cd3 SHA-256: 5f5a6dd38cdaae02abca7ae991965c518a56ca2f479d4f8577568e9e30e35725
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as malicious due to its embedding of numerous links, with one specifically pointing to known malicious redirector infrastructure. The document's content, disguised as an 'Ihs towers annual report', is a lure to direct users to these external sites. The ML classifier strongly supports the malicious verdict, indicating a high likelihood of a phishing or redirection attack.

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/wix?keyword=ihs+towers+annual+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0fdb6d_b5c9120819f64fc1aa4517e6c5c419c1.pdf
    • https://static.usrfiles.com/ugd/df73ab_81665b942b22474eaf78a07d2f913509.pdf
    • https://static.usrfiles.com/ugd/09273f_c8ad4101524843929a8390f348d72934.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_3b1b01e5de35445a9e317cfae8b3ef95.pdf
    • https://static.usrfiles.com/ugd/cf79db_dfe20e890e53460bb8434ebf4204560e.pdf
    • https://static.usrfiles.com/ugd/9a242c_5986238d01e74e1a8123d2b2ed6e48c7.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kaxepetumikikexozifaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/simple_present_tense_exercise.pdf
    • https://cdn.shopify.com/s/files/1/0432/5687/3128/files/66901447670.pdf
    • https://cdn.shopify.com/s/files/1/0440/0083/7782/files/3084376216.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/cable_tray_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5196/6873/files/wudajamumajudepiworagigep.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_off000059b6.bin
c4e9c45ba68510e7fa941cc1345287f2423fd6c4802ea842a38741e42ea43c13
pdf-font-stream PDF embedded font (sfnt) at offset 0x59B6 4936 bytes
font_01_sfnt_off00006a83.bin
b26eafcbe447fe78bfd36a3c6514fec2a55e5157df3954c5483d2b963b6cd648
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A83 10416 bytes