Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb1088a6a960070…

MALICIOUS

PDF

32.2 KB Created: 2020-08-19 03:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61dd17ffb4177912aa154dccaf6514c3 SHA-1: 28b1b587c6dc31c512a20781bf2418804fbac611 SHA-256: 6fb1088a6a960070b44325b5616b7064aa88b3c9b4d8ac67575b5a6ff401e9e4
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest this document is designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

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=factor+polynomials+worksheet+kuta
    • http://files.carriedrobnick.com/uploads/1/3/0/7/130739462/xobeworaloz-vivudu-gavomor.pdf
    • http://files.cshanice.com/uploads/1/3/1/8/131871698/5531453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/antimicrobial_stewardship_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0444/2708/3943/files/untrusted_server_certificate_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0431/1541/3661/files/rogovosuwopuvifuwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4490/4865/files/dutebafadeku.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/xavadufimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/robe_of_the_archmagi_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/59609206004.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/lipol.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/60241523842.pdf
    • https://cdn.shopify.com/s/files/1/0428/0742/7238/files/lasafolo.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_off000042e8.bin
35c2395b99940707e4f5c9e29c8e98f86da7a919873ead3a627b7acd140a5617
pdf-font-stream PDF embedded font (sfnt) at offset 0x42E8 5384 bytes
font_01_sfnt_off00005524.bin
d748d18f1478fc6a41ce9256b34a3ed918c7c569e168b47d03158fdca84cafd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5524 9108 bytes