Malicious PDF — malware analysis report

Static analysis result for SHA-256 175ad6742a8ba4d5…

MALICIOUS

PDF

37.1 KB Created: 2020-08-24 23:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d108c5b8d071a9b1ed033437f9800f6 SHA-1: 61c9c719b48355fc2ec4be63c173625b5e5e5161 SHA-256: 175ad6742a8ba4d502f16319e00b252ea5eb1fc87a884ffe8cb662a90d1cc673
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.ru/pify?keyword=carrera+slot+car+track+planner, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=carrera+slot+car+track+planner
    • http://files.failurefarms.com/uploads/1/3/1/4/131406826/9414637.pdf
    • http://files.teohuwhaiao.org/uploads/1/3/1/8/131856247/1411074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/42522043742.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/49380665078.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodujanizovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/bluecoat_school_oldham_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/15469848746.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/fefitajolubibukulema.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/91889420765.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/86138152514.pdf
    • https://cdn.shopify.com/s/files/1/0433/4193/8856/files/bosonto_ese_geche_song.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_off000046cf.bin
1564ef213886d75ed5310567f0cd517d7ba4eb16f126acd86a224334496d10c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x46CF 4756 bytes
font_01_sfnt_off00005704.bin
a0ab8cf7991f2ffee43e74212e86057db071102b94278c011c95c8f40bfdfa42
pdf-font-stream PDF embedded font (sfnt) at offset 0x5704 10172 bytes
font_02_sfnt_off000079d0.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x79D0 4324 bytes