Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a153a7d95356106…

MALICIOUS

PDF

47.4 KB Created: 2020-08-15 16:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e5ee432e9029fa5aa747fcb2f3df6f SHA-1: b33a8579c7bf41ceccfe89967b4ecaab6e108fa2 SHA-256: 6a153a7d95356106e34402963803b91bfc9cf2ab3b6ee1555bf2a7a15806edfc
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'book report board game project' and the malicious URL, suggesting a lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links points to a link farm or SEO manipulation tactic.

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=book+report+board+game+project
    • http://files.cltreeservicepros.com/uploads/1/3/1/4/131437402/3433632.pdf
    • http://files.supersonicmagazine.com/uploads/1/3/1/4/131437676/1487835.pdf
    • http://files.jcmartinphoto.com/uploads/1/3/1/4/131483955/9163243.pdf
    • http://files.mariecharpentier.net/uploads/1/3/1/4/131483019/batipaxadas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6051/7269/files/88441139332.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6344/files/jaxudi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3399/files/fumajikujijapol.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/dstv_explora_catch_up.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/avoir_etre_faire_aller.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1458/files/tujopojononukipufudedivav.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/gelimipevit.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_off00007aad.bin
b06eb76a620c6da209d8d5776c0a3696ec774d8fa57cc11305e03fa342f296b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAD 5512 bytes
font_01_sfnt_off00008d5e.bin
47682980b3f7096223baa5e3dee1cf4ea4a7eeb2dea5e925533d4f4c6e236bd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5E 10332 bytes