Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a5a2cdcb814e2c…

MALICIOUS

PDF

37.9 KB Created: 2020-08-05 04:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fadd4e74632bdc89797d5df377f59294 SHA-1: ac4bc4a0f1909c435aa843da11b284cdca8f8f22 SHA-256: 77a5a2cdcb814e2c8fe3020e71310ff4c6ca109e1dccb1d47b943197c6680ac5
174 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to distribute further malicious content or lead to phishing pages. The document body, though heavily obfuscated, contains references to product names and URLs, suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links further indicates a link farm or SEO manipulation tactic to increase visibility and potential clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=castrol+edge+turbo+diesel+titanium+5w+40+pdf
    • http://files.ibteens.net/uploads/1/3/1/3/131383358/faxurugisuvuvef.pdf
    • http://files.mmjhorchestra.org/uploads/1/3/0/7/130776131/wuderezu_fibasopegijo_tijemide.pdf
    • http://files.rootedlifecoach.com/uploads/1/3/2/6/132681971/juketuzuloxivux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6931/7013/files/2296858632.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/40644408277.pdf
    • https://cdn.shopify.com/s/files/1/0428/5808/6559/files/61922049610.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/91222213029.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/rutofolo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5078/files/48852175051.pdf
    • https://cdn.shopify.com/s/files/1/0439/0112/4760/files/lirofufiritarozaken.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/5234739698.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/12318985288.pdf
    • https://cdn.shopify.com/s/files/1/0434/5747/8809/files/56198372107.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6584/files/va_form_28-_1900.pdf
    • https://cdn.shopify.com/s/files/1/0429/0514/1411/files/vadezane.pdf
    • https://cdn.shopify.com/s/files/1/0439/8769/7822/files/zobow.pdf
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/refisixol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6960/files/taweterovomalupiberew.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_off00004fdd.bin
6c6e2bdb5b825e57b6bc96c1969bb1e549ad75430106fb6e07655ac04cde2aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FDD 5852 bytes
font_01_sfnt_off000063c4.bin
c36fa23f034f4889425369c427d912f0738e81441b5922c491813d884db0f72e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C4 11344 bytes

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