Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8055045d09ba1c…

MALICIOUS

PDF

100.0 KB Created: 2020-08-06 18:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 928ec6bc3d631a66f54b7e704a194609 SHA-1: de509a30217c19c12d9c52bde2650879ac894c0f SHA-256: 7a8055045d09ba1cf3df78ca4af234420bfe8b3c369aa994e76208ce31d18344
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 external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=operations+management+a+supply+chain+process+approach+pdf
    • http://files.reddsocialstudies.com/uploads/1/3/0/7/130740563/f2a7936e492.pdf
    • http://mokute.realty33.com/uploads/1/3/0/7/130775519/luzuwo-xukuzos-lumudufalolimul-fowixidej.pdf
    • http://files.cbpencil.com/uploads/1/3/1/6/131637374/2558997.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/wawipowawidaliwomezex.pdf
    • https://cdn.shopify.com/s/files/1/0429/2381/9164/files/tirorekezawikem.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0431/0184/7708/files/52650046441.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/kirk_franklin_stomp.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/4003416871.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tevedizulav.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/pusaviwom.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/93555004120.pdf
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/zibalaguzir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/65591596740.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2948/files/kisikil.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_off00013f73.bin
2014311bfd297657342cf94c3ccf1827df99d3e246d299989e6d69235a1ebed7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 5700 bytes
font_01_sfnt_off000152ae.bin
95e49ebf325dcdc447991ea6afd47dcbe77c8285cd0545e24e4b155de5ad249f
pdf-font-stream PDF embedded font (sfnt) at offset 0x152AE 15420 bytes