Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62e83a43e7a6147…

MALICIOUS

PDF

53.7 KB Created: 2020-08-25 22:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecf3c7a2693cea42a0b62badc82ab7b8 SHA-1: 0fadc0f43e2b8e2cec20436c4f76764411f9448f SHA-256: f62e83a43e7a6147ec64db578dc07562996dd96c1a157179ef33be215296cfcd
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body and embedded links suggest a lure related to 'opinion essay samples' to entice clicks. The PDF also hosts a large number of links to other PDFs, many hosted on Shopify, which is characteristic of SEO link farm abuse. No scripts were extracted, but the primary malicious behavior is the redirection via the embedded link.

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.cc/pify?keyword=opinion+essay+samples
    • http://gipuzisuw.zouziasmdsports.com/uploads/1/3/1/1/131164312/zuvuvapid-vusazulosisi-lutigepox-donasopixege.pdf
    • http://files.biencuitnyc.com/uploads/1/3/1/4/131407164/bab16460d.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/bezesotokade.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/20651779929.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1414/files/jotigevifeji.pdf
    • https://cdn.shopify.com/s/files/1/0434/5646/3014/files/arabic_alphabet_colouring_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/93172819421.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4181/files/77702511190.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/23209339209.pdf
    • https://cdn.shopify.com/s/files/1/0445/1424/6815/files/xobesigonuzusoxasenu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/japupasatenakal.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2802/files/58805801735.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_off00009702.bin
34409b514c12e65c375ae6db3e2c783a1bb38870bc30e0a433d935d5cdfe7d87
pdf-font-stream PDF embedded font (sfnt) at offset 0x9702 5000 bytes
font_01_sfnt_off0000a7f0.bin
d6211a1b31616356011c14aa2510cf7b84ef50bc2120be05912381021dda83be
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7F0 9900 bytes