Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0057c8eea0880c2…

MALICIOUS

PDF

42.1 KB Created: 2020-08-13 23:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9bf23a61754dabfb4263908640f6cf3 SHA-1: a4aecfdf69caedf868e068438de3214e3c8c1cd3 SHA-256: d0057c8eea0880c2f68e36620720204c42bc13d4325bb6d827cac3e1b6cd7916
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is disguised as an accounting cheat sheet. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and other links, suggesting a deliberate attempt to lure users to malicious infrastructure.

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=debit+and+credit+accounting+cheat+sheet
    • http://gonorip.nickschumacher.org/uploads/1/3/0/8/130874197/tepexetev.pdf
    • http://files.hope.cr/uploads/1/3/1/4/131437932/9859366.pdf
    • http://files.newreach.com/uploads/1/3/0/8/130874317/416eacc5386200c.pdf
    • http://lulopek.wildsidedestinations.com/uploads/1/3/1/6/131606255/5b249fd9cc5.pdf
    • https://cdn.shopify.com/s/files/1/0428/4373/4172/files/57560381873.pdf
    • https://cdn.shopify.com/s/files/1/0429/6278/0311/files/gesufume.pdf
    • https://cdn.shopify.com/s/files/1/0448/3910/8770/files/office_clerk_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6111/files/44909331065.pdf
    • https://cdn.shopify.com/s/files/1/0451/1770/2298/files/63526135606.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16485275060.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29025511016.pdf
    • https://cdn.shopify.com/s/files/1/0438/2805/2130/files/96363785719.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/47530213199.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/vumibowadejavizaguzivumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/dimunevelaza.pdf
    • https://cdn.shopify.com/s/files/1/0430/7356/8919/files/virixerenodanuvopixun.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/lamenalamisulezotub.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_off00006481.bin
67d3724ff43fa26aaca0947d0473c06dce6c2c60a1d2bdaea6832bc0d26b22d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6481 5308 bytes
font_01_sfnt_off0000767b.bin
65ea472f07c661b3cbf7b1c95a7c38fcdd9cb26e1ca4c05b044ec937ba0e7708		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767B 10944 bytes

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