Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0523fc3717dd062…

MALICIOUS

PDF

42.7 KB Created: 2020-08-21 01:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d84573249d10988a787cc6d6e151ffea SHA-1: 5b0973d623ddcad7f386881d85520bd5656a8374 SHA-256: c0523fc3717dd06288f0fada661225b3294abf3dc98df924513c9a8040e10683
152 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector service, which in turn points to a link farm hosted on Shopify. The primary malicious link is "https://ttraff.com/pify?keyword=acceptable+forms+of+id+for+i9", which is designed to deceive users into clicking it. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed for SEO poisoning to distribute malicious content.

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/pify?keyword=acceptable+forms+of+id+for+i9
    • http://files.interwovenproductions.jojospinks.com/uploads/1/3/2/8/132814465/9014109.pdf
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/najokonirofisalijigojij.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/zevejowibexi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/axios_catch_error.pdf
    • https://cdn.shopify.com/s/files/1/0434/9588/2918/files/muwejesana.pdf
    • https://cdn.shopify.com/s/files/1/0430/4338/9597/files/rawof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/85986298653.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/lumuludine.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/98832290659.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/linux_bash_scripting_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/1054/6070/files/alt_code_for_copyright.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/pimidokemupiso.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_off000067e6.bin
409947ae2056c999d8360116afa436f6319ed3386b5db641744f33640a43c1d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E6 5584 bytes
font_01_sfnt_off00007ab6.bin
ea7821bb57619db555a0b0a2ea10ff2a639352243935b7344e7afca7d9439373
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB6 10648 bytes