Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb91da3cf622225…

MALICIOUS

PDF

40.9 KB Created: 2020-11-05 03:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 896b7ada6196efb31451de9cb20a46c5 SHA-1: 988bd01fcb04639f004f90c5283978194580aee9 SHA-256: 3fb91da3cf6222250344ad927f036140bc278b419f55ec6ea4b87a7788b01b1d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm and redirection to potentially harmful infrastructure. No scripts were extracted, but the document's structure and embedded URLs suggest an attempt to lure users to malicious sites, likely for SEO spam or phishing.

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/123?keyword=holley+4160+air+cleaner+spacer
    • https://cdn-cms.f-static.net/uploads/4392444/normal_5fa2f8194fb9f.pdf
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/mexenewuvotak-lodogo.pdf
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/nipilatob_xuferi_vakawita_kefuwoz.pdf
    • https://cdn-cms.f-static.net/uploads/4449410/normal_5f9e0b9845752.pdf
    • https://folanejo.weebly.com/uploads/1/3/0/7/130776558/jedub_nasevovo_nudesatexuwed_powikapuzobuj.pdf
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f9b2d4c889cd.pdf
    • https://cdn-cms.f-static.net/uploads/4446781/normal_5f9f8c4d14097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mijedusovineti/cloud_computing_security_risk_assessment.pdf
    • https://uploads.strikinglycdn.com/files/f10b637d-e376-4881-9ca6-da3ab2157ac5/lijizusex.pdf
    • https://s3.amazonaws.com/leguvefu/jazewegomenobuja.pdf
    • https://s3.amazonaws.com/felasorarabipis/67143570431.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_off000051b1.bin
ffa5e3b2a28e8c3d1373ee22b2c1bdb2645aee8ddde89e97c07fee109af9b104
pdf-font-stream PDF embedded font (sfnt) at offset 0x51B1 5136 bytes
font_01_sfnt_off00006329.bin
bd70df6fa0ad1bf377bb88e5e4a980cecfa199cc56f52e14237cc382dd25092f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6329 11120 bytes
font_02_sfnt_off0000890e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x890E 4324 bytes