Malicious PDF — malware analysis report

Static analysis result for SHA-256 7451e38bad7ffeb7…

MALICIOUS

PDF

44.4 KB Created: 2020-08-23 07:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf315d5f2718e9d3624183450cca1f1b SHA-1: 176355222b5a1743eb3f24feaa4e29c264745030 SHA-256: 7451e38bad7ffeb71fccc08ab5d87b5742386c21aca65654184ea1aa21195054
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a malicious redirector URL (ttraff.cc). Another heuristic flags it as a PDF link farm, suggesting an attempt to manipulate search engine results or distribute content. The document body, though heavily obfuscated, contains a reference to the malicious redirector URL, reinforcing its role in the attack chain. The ML classifier strongly indicates 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.cc/pify?keyword=bruchrechnen+%25C3%25BCbungen+pdf
    • http://fuvut.mapmrc.com/uploads/1/3/0/8/130813612/wejebonapotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8898/6787/files/kiwizuzupilinaxatiwim.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/66388011871.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/adorno_dialectic_of_enlightenment.pdf
    • https://cdn.shopify.com/s/files/1/0435/2753/6799/files/41078143176.pdf
    • https://cdn.shopify.com/s/files/1/0432/3655/6962/files/kireloroxel.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/2363099376.pdf
    • https://cdn.shopify.com/s/files/1/0441/3816/8472/files/pajemusaretegijiromu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/begevegibapobigenafibux.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3029/files/round_two_decimal_places.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/vufinebu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4533/9814/files/99828303208.pdf
    • https://cdn.shopify.com/s/files/1/0434/3326/3253/files/pokibumojole.pdf
    • https://cdn.shopify.com/s/files/1/0434/2222/0439/files/79563767195.pdf
    • https://cdn.shopify.com/s/files/1/0440/3747/2421/files/pamowaxoj.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_off000063a9.bin
6cc4324297080621aa61a48418099f6c724366f4b5a5eda65dba554ac8f4f8c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A9 5304 bytes
font_01_sfnt_off0000757a.bin
b40517c467abd8d62727116f2c19d896746c553cf306b5f2bcf0eab209c707ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x757A 14948 bytes