Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24eaae7b61c39a7…

MALICIOUS

PDF

54.9 KB Created: 2020-07-31 14:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aea17ebb3752d95a4e71bfcec5f4144 SHA-1: 99a3af7d8136badfe304051c13e4d24fbcab63ce SHA-256: b24eaae7b61c39a7f61ae0b2a95f56a736756d8a92bc6dee0117ff10ebde4075
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a link to a known malicious redirector infrastructure, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, appears to be a lure related to 'bible quiz questions and answers'. The presence of a mass external PDF link farm further indicates a malicious intent to distribute content through numerous links, likely for SEO poisoning or to host further malicious documents.

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=bible+quiz+questions+and+answers+in+malayalam+pdf
    • http://files.nickydelariva.com/uploads/1/3/1/6/131637656/tanubepuna_vuxenusu_zilodevomalora.pdf
    • http://files.annasalimon.com/uploads/1/3/0/9/130968984/2504653.pdf
    • http://files.dancewithmestudios.com/uploads/1/3/1/4/131406751/0b25a68f5c8.pdf
    • http://files.tinyhivedesign.com/uploads/1/3/0/8/130813732/0829f.pdf
    • http://files.dancewithmestudios
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/sukibesubikukurasofaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/lobotojig.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/89972797438.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/35995680818.pdf
    • https://cdn.shopify.com/s/files/1/0433/6048/5541/files/14803472024.pdf
    • https://cdn.shopify.com/s/files/1/0434/0544/3233/files/95399665200.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0636/files/pozijorosupanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1173/files/22446960807.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/3447633596.pdf
    • https://cdn.shopify.com/s/files/1/0432/0981/8272/files/gomikudetupezego.pdf
    • https://cdn.shopify.com/s/files/1/0432/9691/5621/files/jotit.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8455/files/wopolarufebalovituvavumej.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/wajojonumijo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/tavit.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000097a5.bin
f0d4166f969211f7ec52f62174c7a03a02a57b2feab0fe68b7c17c4a6d3095c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A5 5628 bytes
font_01_sfnt_off0000aac0.bin
e0260dadaa1121042007b25e4ade7a0d0e0ccc3900b402a1d9ee5252d0970745		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC0 10176 bytes

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