Malicious PDF — malware analysis report

Static analysis result for SHA-256 a492ae3b053c3d00…

MALICIOUS

PDF

74.0 KB Created: 2020-11-02 05:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be5dc98a37fe67409f8a6703600e371c SHA-1: 12086bfabb1966a1615574aa593a38d9aca8a13f SHA-256: a492ae3b053c3d007107d0e8ee4a3ee4d441907bd981ccbaa8f2631f1c611fb1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://ttraff.link/123?keyword=electron+configuration+chart+fe'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external PDF links, suggesting an attempt to distribute or obscure malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.link/123?keyword=electron+configuration+chart+fe
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f915b7d65306.pdf
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5f99c50faf0a0.pdf
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/zofawebilakodogupe.pdf
    • https://rizidapovo.weebly.com/uploads/1/3/4/3/134316848/42df2766f8d3.pdf
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f88417e8d33a.pdf
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5f977ca6f0f2a.pdf
    • https://cdn-cms.f-static.net/uploads/4419642/normal_5f9ca7c863069.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a5388733-c0f5-4c22-b78a-1174f200dd85/74614458158.pdf
    • https://s3.amazonaws.com/busutafitufe/dub_houston_car_show_2017.pdf
    • https://uploads.strikinglycdn.com/files/67b6f989-3e73-4b26-b111-c5152fe9f449/13455255616.pdf
    • https://s3.amazonaws.com/tometubufimopim/5104859059.pdf
    • https://s3.amazonaws.com/gupuso/98720254736.pdf
    • https://uploads.strikinglycdn.com/files/a3c949b5-e8fa-421c-b994-30e8460d6fc3/44653055.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc65.bin
797824b9a52f866adaa31f97fd108a9b67c5b65f327b88922003ce99f7739ff1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC65 4804 bytes
font_01_sfnt_off0000dcb3.bin
00d1910a96c6e19b75f9ce6a9f30c27b8432e06c6c8811fb395716362b13e12c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 13444 bytes
font_02_sfnt_off00010aa6.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 4324 bytes