Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d02a8923edf102…

MALICIOUS

PDF

42.8 KB Created: 2020-08-02 17:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afe1f0be98a257b9cad7d82da0ebd556 SHA-1: a3ec9fd3f0587e71115747c6b46d4a8c1524e0fa SHA-256: 67d02a8923edf10220c461a5ff04ef55eeba8c44483d32447d3d6d4ec04b1594
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 what appears to be a link farm designed to improve search engine rankings. One of the primary links redirects to malicious infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=transport+phenomena+revised+2nd+edition+pdf+download
    • http://files.rwjbhinstructors.com/uploads/1/3/1/3/131381540/8185104.pdf
    • http://files.stoneofhopeyouth.org/uploads/1/3/1/4/131410485/6048305.pdf
    • http://files.accreditedbeautyshortcourses.com/uploads/1/3/0/7/130775384/depipodolenasum-jabupotidiz-joramekikipat-besiga.pdf
    • http://files.jennysdelights.com/uploads/1/3/1/1/131164476/d69aad3d476.pdf
    • http://files.caasfepconference2020.org/uploads/1/3/1/4/131454316/3755089.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fokukivovasogu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/90206268776.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/xikawukemozatudem.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/sipelolazujokinibobi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8042/4351/files/76344809408.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2735/files/13661018111.pdf
    • https://cdn.shopify.com/s/files/1/0438/2064/6562/files/zejolod.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/70534174200.pdf
    • https://cdn.shopify.com/s/files/1/0434/4371/6262/files/rumedoborajeja.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/91204622692.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/batopojasefobak.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_off00006837.bin
bc1e63b2a2d5003c1b66961eb5f8049f44580abbdd503781a05363c2a10a3de8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6837 5516 bytes
font_01_sfnt_off00007ae6.bin
92fa922e5280800bab66a7605878df92f5466e23b7227f985f587c772c583bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE6 10224 bytes