Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0a1b2840f2af66…

MALICIOUS

PDF

59.4 KB Created: 2020-08-12 22:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d6069cf37a49e052878c2a04a6f1c1c SHA-1: eb3fbe3334969e92c76cb748ba50316fea27f5c3 SHA-256: 1c0a1b2840f2af66fb2ba94750e8aebf9e5c186d51d3ca8e39aa0f1384b0a067
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, indicating a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bescherelle+pdf+vk. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the malicious URL and several other Shopify-hosted PDF links, suggesting a coordinated effort to distribute malicious content.

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=bescherelle+pdf+vk
    • http://files.sakivintagekimono.com/uploads/1/3/2/6/132695569/1c88146aec.pdf
    • http://files.franhillpharmacy.com/uploads/1/3/2/6/132680784/tegof.pdf
    • http://kimob.identity-igif.org/uploads/1/3/1/4/131438800/449fae6f28.pdf
    • http://files.jiniepku.com/uploads/1/3/1/4/131453967/4735930.pdf
    • http://eubooks.org/fr/livre.html?id=76#VK
    • http://eubooks.org/fr/li
    • https://cdn.shopify.com/s/files/1/0441/2515/9576/files/susapuponaserubujariva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/megorefudubibizunapamiris.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/liwaragenarowaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/common_interview_questions_and_answers_for_experienced.pdf
    • https://cdn.shopify.com/s/files/1/0432/4301/2256/files/4836588468.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/ribapivobanirizafusaxup.pdf
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/31313721574.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/zazoboxenutavimitawugobet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/majagipiposodete.pdf
    • https://cdn.shopify.com/s/files/1/0434/5616/8093/files/rurabupanuwo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1044/9830/files/bafosegutugularut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000959f.bin
f49b982b6706cdeffd8959583889b33196881ee9f0aee67673d4c73409e7c1b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x959F 5280 bytes
font_01_sfnt_off0000a7e6.bin
8f0765a882460b82363205ece3da8bd8d069831472348f666b5b54be6edb4a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E6 5208 bytes
font_02_sfnt_off0000b99f.bin
149e478134bc011ff5471f8af468397fa945f4b1a7a1041ab0bda92623f0ea62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB99F 11884 bytes

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