Malicious PDF — malware analysis report

Static analysis result for SHA-256 b379164e81cc9124…

MALICIOUS

PDF

53.3 KB Created: 2020-08-20 12:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2744db24ea2f6d8455504737c8ad96cd SHA-1: cfbd6eb25ae1ac90028d05926621efecf2f25859 SHA-256: b379164e81cc912429463c982c889f5946b072b52853e5bc69f5e067a3087e54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though partially obfuscated, contains the same redirector URL and also lists numerous other PDF files hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or redirection scheme.

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=o+que+%25C3%25A9+forma+benevolente
    • http://bikum.eleganthealing.com/uploads/1/3/1/4/131453433/4255645.pdf
    • http://files.piltzfamily.waggamatters.com/uploads/1/3/1/8/131871585/1357589.pdf
    • http://mepiz.girardksfcc.org/uploads/1/3/1/6/131607163/de38c522d11f7b1.pdf
    • http://mejigepu.namioncampusuno.com/uploads/1/3/2/6/132682790/82ca4b276d85b.pdf
    • http://files.havenswood.org/uploads/1/3/2/6/132695194/zesuratilixoz-kuvafaxelas-morudotonida-vibibepifafiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/gb_whatsapp_free_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/vaxavolig.pdf
    • https://cdn.shopify.com/s/files/1/0434/0200/2595/files/esl_reading_comprehension_pre_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/14797964172.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/rurunuvinugeboneke.pdf
    • https://cdn.shopify.com/s/files/1/0459/9840/7837/files/siden.pdf
    • https://cdn.shopify.com/s/files/1/0438/9535/7595/files/bordereau_de_dpt_desjardins.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/domalolokozelaxizu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/principle_of_atomic_absorption_spectrometer.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009020.bin
49016c2ebe22289921ee4e9c78b9fc7fbe8148a7b115d6b4ff09e8dc5a4b97a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x9020 5228 bytes
font_01_sfnt_off0000a199.bin
4412beba5df1f1f5581bf3c254c4ff3e76e834d0ab0a568fd063da10ed4f5970
pdf-font-stream PDF embedded font (sfnt) at offset 0xA199 12264 bytes