Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b2181e501a5ff3…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 08:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92ef0f5e266f89265e760cb5089b7e24 SHA-1: 633123f6dede2ebbaa4b6482953c0c654d7ba17c SHA-256: 65b2181e501a5ff3522b58e4ee751b2c0dd46b4d4c4e68cd688910f9568f1f09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text suggesting it is related to 'national electrical estimator pdf', likely an attempt at SEO poisoning to attract victims. The presence of many external PDF links further supports this, as does the ML classifier flagging it as malicious.

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/wix?keyword=national+electrical+estimator+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8153/1541/files/clasificacion_de_los_antidiabeticos_orales.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/pumunele.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/32519914974.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9858/files/filawusuvejebudamaxagi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2758/files/zerg_rush_builds.pdf
    • https://static.usrfiles.com/ugd/b8c837_7eaebefef42b4d12b2474f6936f870e8.pdf
    • https://static.usrfiles.com/ugd/0049ca_b17992682b5845ef8f1bc7b36b313e4e.pdf
    • https://static.usrfiles.com/ugd/696117_df61cb0eadb0418aa8e3f2803bc73915.pdf
    • https://static.usrfiles.com/ugd/f46427_33a6d25b31fe48779770cdd996da684e.pdf
    • https://static.usrfiles.com/ugd/b8c837_681d5d5fb3eb4682a5c791d1f1f60db0.pdf
    • https://static.usrfiles.com/ugd/0049ca_98c6d5dae28648b890bdb28801618bae.pdf
    • https://static.usrfiles.com/ugd/e73fea_608a9bae2e7342559fa89febee50586f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bc87731a82d48708873da3b9bc1b9ed.pdf
    • https://static.usrfiles.com/ugd/3aca14_be58f8f440c448e9942672bcb7f1174b.pdf
    • https://static.usrfiles.com/ugd/516574_013f86011ea54c80b74cddd1bee227a4.pdf
    • https://static.usrfiles.com/ugd/b914b5_517cd5606b7342a2b995b4b2aab1c640.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_off00006928.bin
669a7028af1a69cbc38a3499a27e85377daf5e46ff28a75f06984256f6d50e7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6928 5268 bytes
font_01_sfnt_off00007af9.bin
3a9f2f56254afed933b9cb1702c5bb177f16941929e1d091a2929264de67cead
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF9 10700 bytes