Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad7fb346621404d…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 21:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0751898124d2e69b52d31b9650cf9144 SHA-1: d1ce25d21481b2cc985f079b779534db6fc921b1 SHA-256: 6ad7fb346621404d7b9dcbde455de22e498ec5d05123ff89f127e033c1ed6ca9
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=counting+objects+worksheets+1-+100', which is likely intended to lead the user to malicious content. The presence of many external links also suggests a link farm or SEO manipulation tactic.

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.cc/wix?keyword=counting+objects+worksheets+1-+100
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/gebaxopinodijep.pdf
    • https://cdn.shopify.com/s/files/1/0432/5012/2916/files/javapibetaket.pdf
    • https://cdn.shopify.com/s/files/1/0465/5493/9542/files/nebij.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/83108876290.pdf
    • https://cdn.shopify.com/s/files/1/0440/9671/6952/files/kutefopuvitazavafudox.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/pamuxuwufarod.pdf
    • https://static.usrfiles.com/ugd/eb4c03_deed6ccf22f549d6b8b2e05d59a54ef3.pdf
    • https://static.usrfiles.com/ugd/934fc3_296f862307794332af6570d6ca296bcf.pdf
    • https://static.usrfiles.com/ugd/7598fa_9a5b372e109d485f92ea9d09e0248dc7.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9529/files/widopitifitedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42228357160.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/zudikuzap.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_off000071e4.bin
9dc4b8712eaee7ad4aafdfbc0eb954643dd6a954bfa3f722d4f47e1a8589a303
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E4 5320 bytes
font_01_sfnt_off00008425.bin
b1536ef6682e3793c478ce3bc7369cc027d5c1d574ca861113ae4ee4c9133899
pdf-font-stream PDF embedded font (sfnt) at offset 0x8425 10608 bytes