Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae65572c9c900d90…

MALICIOUS

PDF

41.6 KB Created: 2020-08-23 13:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e435a81567497db3454d3aa2f1db113f SHA-1: 9adfff86ade7955fa54a4b11b3919111cba5a789 SHA-256: ae65572c9c900d903ca8072866c473d3f57f3bf70799be1d7a56bb312fc6f1ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a prominent link to 'ttraff.com' which is flagged as a malicious redirector, disguised with the text 'A1 driving school homework answers'. This suggests a phishing or scam attempt to lure users to a malicious site. The document also contains a large number of embedded links to Shopify-hosted PDFs, likely part of an SEO link farm to improve search engine ranking for malicious content. No scripts were extracted, but the presence of the malicious redirector and the deceptive document body strongly indicate a phishing attack.

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=a1+driving+school+homework+answers
    • http://files.funkyiceclothing.com/uploads/1/3/0/9/130969254/7421809.pdf
    • http://files.sbdpromotions.com/uploads/1/3/1/8/131856627/sodemuzavi-pawesufeletax-widonu.pdf
    • http://files.tuftslaw.net/uploads/1/3/2/6/132683000/5255025.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/comprehensive_respiratory_therapy_exam_preparation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/4385/5258/files/mathematics_formula_for_competitive_exam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2594/8072/files/90726681540.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevegijetowid.pdf
    • https://cdn.shopify.com/s/files/1/0429/0753/3475/files/vanukupedugiselozed.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7500/files/gezadaselolakipu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/us_history_textbook_11th_grade_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/fukebe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/zokig.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/88273385924.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063da.bin
4e09c3cd5dc5ae95e41e63d863c411d353798bb1d4d8a447e9cd53a75187a199
pdf-font-stream PDF embedded font (sfnt) at offset 0x63DA 5608 bytes
font_01_sfnt_off000076d7.bin
62af32fe3592020af65d0e3dbe64ebd560aff4019dea1894e2316de8522a485e
pdf-font-stream PDF embedded font (sfnt) at offset 0x76D7 10312 bytes