Malicious PDF — malware analysis report

Static analysis result for SHA-256 640fd90eff42060a…

MALICIOUS

PDF

31.9 KB Created: 2020-09-07 10:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b0eaaa6c279e3bffbde0af707161511 SHA-1: ba82d862dc30ebf7913f06d9ddd07f2d906af01e SHA-256: 640fd90eff42060a381393d814b157f7c9418ae9bdc0a30bed96dbda055a3dde
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.me/wix?keyword=bajaj+allianz+life+goal+assure+fund+performance, is identified as a malicious redirector. The document also features a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful content.

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.me/wix?keyword=bajaj+allianz+life+goal+assure+fund+performance
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8311/1336/files/eccentric_reducer_pump_suction.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/lefubevimipu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3829/files/xoworigep.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/easy_way_to_learn_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/robotic_arm_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/bpo_startup_business_plan.pdf
    • https://static.usrfiles.com/ugd/576447_d95bbbfc01954d94b02b56b8c9b709a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b798244337974331a7ca0fb43a6ad61f.pdf
    • https://cdn.shopify.com/s/files/1/0429/0386/3459/files/65004979572.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/bivegodawuman.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_off00004001.bin
a81e99298bd08667fca5246fca354b73922bf399673c654c0ac33063ed37d4ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x4001 5652 bytes
font_01_sfnt_off00005337.bin
b3ce1443c929e2ab07934aee2967d94c76cb900684ca0f664e61e1bf4f6edf7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5337 9248 bytes