Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4fe1279016830a…

MALICIOUS

PDF

49.3 KB Created: 2020-08-03 14:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00c1c66de45d9fee77c1ab828b0707e4 SHA-1: c3d58f26c1f6b50a62a8b8d5f7a57beba5953c4c SHA-256: 6b4fe1279016830a540abef56bf904ccec8a0bea23f88e8bcebaa1f7b099dd66
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'gmat critical reasoning practice test pdf' and a URL pointing to 'ttraff.com', suggesting a phishing or scam attempt. The presence of numerous external PDF links also points to a link farm or SEO abuse 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.com/pify?keyword=gmat+critical+reasoning+practice+test+pdf
    • http://files.maryblum.com/uploads/1/3/0/9/130969448/5312966.pdf
    • http://files.misplacedchef.com/uploads/1/3/1/4/131407530/nixupajuwugavanuk.pdf
    • http://files.allinonepropertymanagement.ca/uploads/1/3/0/7/130739081/nividuripedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/9364788055.pdf
    • https://cdn.shopify.com/s/files/1/0431/1210/4103/files/83403871455.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/92837222284.pdf
    • https://cdn.shopify.com/s/files/1/0434/0134/7226/files/96628795447.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/18455306608.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/w4_in_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0434/5702/0056/files/flask_file_upload.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/sublime_sublime_zip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0429/3731/9590/files/vomonewiziwatimaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/kedegokut.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_off000077c7.bin
62476c8035dc9c1e59bde1c405bd2d3516d4dd0f9f4f532727491b95c7dfde57
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C7 5508 bytes
font_01_sfnt_off00008a67.bin
6d5e563d9ecff5411054d6a5f00d06e974daed91da7e88cb312a74a714170f30
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A67 13936 bytes