Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1581bc8f688c2b…

MALICIOUS

PDF

42.2 KB Created: 2020-07-30 19:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f846aa38448ce61a6997ea3e7692d1fe SHA-1: 4c9de49bf98bbe9e89f78217913a5ae68e3b4b6f SHA-256: 0c1581bc8f688c2b8740010978b5f56659569f725dcc0af80f55f91af5fefb30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm designed for SEO manipulation. One prominent link directs to a known malicious redirector, suggesting an attempt to lead users to harmful content. 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.com/pify?keyword=z80+assembly+language+programming+leventhal+pdf
    • http://files.katsparklez.com/uploads/1/3/0/9/130969966/e7b61e58926.pdf
    • http://files.alexandriatalley.com/uploads/1/3/2/6/132695301/pejibow-tiwunimikerizen-pugolokebagor.pdf
    • http://files.fiveopen.com/uploads/1/3/1/6/131607023/4042136.pdf
    • http://files.storiadeldiritto.org/uploads/1/3/1/6/131637484/e16267ff26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/vofeboxujanegaseforax.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/soxos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/jofimudivijojexepud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/0849/8591/files/82342288302.pdf
    • https://cdn.shopify.com/s/files/1/0435/3412/3160/files/joxedadugesode.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/pibik.pdf
    • https://cdn.shopify.com/s/files/1/0437/6569/4613/files/jipunuxederojusubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nezax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/50567883553.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/47267851447.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_off000064e7.bin
1d81011a5d66cb9b216e91466fa217b5b5fd8f7e9309ce7fd4816541032bf0a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x64E7 5932 bytes
font_01_sfnt_off000078e5.bin
d9eef4b514f04aeaa934eba6cc81a8c86472c15518dfd8b3ae538f9af112c7c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E5 9976 bytes