Malicious PDF — malware analysis report

Static analysis result for SHA-256 d67aa559aa5b369b…

MALICIOUS

PDF

40.6 KB Created: 2020-09-03 06:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 285e183dc2fa7f84d75cad71afb005c6 SHA-1: 59d3becd0fb9afe4f51c6335d901f1c5c0f4139c SHA-256: d67aa559aa5b369bfd1d88f3330ff08b8ae5d406d6056db6694b810372877797
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=resignation+letter+sample+pdf+philippines', is designed to lure users into clicking it. The document also exhibits characteristics of a PDF SEO link farm, with numerous external links, suggesting an attempt to manipulate search results or distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution scheme.

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=resignation+letter+sample+pdf+philippines
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/defining_relative_clauses_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/sotisepuzujenutiti.pdf
    • https://cdn.shopify.com/s/files/1/0440/7354/9974/files/digital_image_processing_ppt_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/5941/1094/files/large_pouch_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0434/3575/3639/files/air_pollution_project_report.pdf
    • https://static.usrfiles.com/ugd/d13e1f_88035b453e0c4e7d985b4c2c59288843.pdf
    • https://static.usrfiles.com/ugd/b0cd75_a6ffab53a038462388eeaad926905fb8.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/testing_acids_and_alkalis_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/7878/5951/files/27218773148.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/jeloperosutalenimiraz.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/1716826609.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/jiwexizanusejeti.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_off00005f84.bin
84351d92bb498f5c9dd21bd31e197987a449080c773f842204637295747d4831
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F84 5464 bytes
font_01_sfnt_off000071f3.bin
b725cccd2b6d5b6e6487001d9029ace73d8cf8267ae49cceb407d8060be15a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F3 10480 bytes