Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b907481dc8037a…

MALICIOUS

PDF

41.3 KB Created: 2020-08-21 16:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5dc5ea6cc7ca2417ddb9410fbc0515a SHA-1: 0666eaeec6ab85662b2492605ab0d6e80bd1d2bf SHA-256: f7b907481dc8037aef8b6e98f76d463d69d0589367e40f9f2f95ef27b9998bb3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a mass link farm, with a primary link pointing to a redirector hosted on 'ttraff.ru'. This redirector is associated with malicious activity and is disguised with the lure 'peter thiel pitch deck'. The document body, though heavily obfuscated, contains the same malicious URL. The presence of numerous links to Shopify-hosted PDFs suggests an attempt to obscure the malicious redirector by embedding it within a larger, seemingly benign link farm.

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=peter+thiel+pitch+deck
    • http://files.dcchurchofchrist.org/uploads/1/3/1/1/131164446/1ec552f4181.pdf
    • https://cdn.shopify.com/s/files/1/0430/8461/1733/files/60872232037.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/wifiwomoxepokanixafid.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/8457114721.pdf
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/pepivopuwono.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/alchemical_marriage.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7572/files/xuloporutupematojaxuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6764/5857/files/carillion_kpmg_report.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/81359561675.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/susav.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/96293574699.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/4769384936.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_off000064ee.bin
a2c97cc5afd0bc0695d6afdbd0885b13c5f4c3a176535d6ce67e8ada43156a1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 4836 bytes
font_01_sfnt_off00007553.bin
98e9e944153c15fa521a583cd1f06ac05060c2c7807dd70ccba7c0d07e31e0fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7553 10444 bytes