Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4aeb72161ddc08…

MALICIOUS

PDF

43.5 KB Created: 2020-07-30 16:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76c979ada837f2762c2258d9ea866a2d SHA-1: b872c253fd08e3193d663c013b38ad1cb1357371 SHA-256: 6f4aeb72161ddc08e6a16eb49a1cc2946c88a5bea91954eef7d3718cb08cc34e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. These links ultimately redirect to a malicious domain (ttraff.cc), indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering through deceptive links.

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=common+core+math+6th+grade+pdf
    • http://files.aquashieldinc.com/uploads/1/3/2/7/132710784/7418432.pdf
    • http://files.caribooliteracy.com/uploads/1/3/1/4/131407565/popirobamis-sijeguna-xisanozim.pdf
    • http://files.davesartdimensions.com/uploads/1/3/1/6/131606348/vojetiborakupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6127/9896/files/35342803464.pdf
    • https://cdn.shopify.com/s/files/1/0433/5671/7205/files/lutokafujipelokamisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/29548810540.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6599/files/selekagowepotegibusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/negozito.pdf
    • https://cdn.shopify.com/s/files/1/0440/7413/9813/files/38582162968.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8068/files/60362991259.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/93932991691.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/jirotogiwisotenipub.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/25526954101.pdf
    • https://cdn.shopify.com/s/files/1/0430/5325/2757/files/30187910405.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dfe.bin
a53d1abec92c8bbdcbf6bb2a92ce605f4cb08ef616220f862c0efb8cfe7649b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFE 5276 bytes
font_01_sfnt_off00007fb2.bin
a459808e6a2035bfe94bf9de324757a9cb702afdb421960cb16e0cc11b7d9c28
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB2 9816 bytes