Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d91e83803e57ca8…

MALICIOUS

PDF

33.3 KB Created: 2020-08-18 13:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b12b8e1930a729e7ee96fd8af8380cd SHA-1: 65887795c5e5dea6dd660e3583aa5a8ea1dbf5a5 SHA-256: 3d91e83803e57ca8a0cc02d1ec68fd47227aba23c579f80937b274388e36daf8
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a redirector link to ttraff.ru and a link farm containing numerous external PDF links. The document body, though partially corrupted, contains text related to a Punjabi movie and the wkhtmltopdf tool, suggesting a lure. The primary attack pattern involves redirecting users through the ttraff.ru domain, likely to a phishing or malware distribution site.

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=lahoriye+punjabi+movie+amrinder+gill+free
    • http://files.the8blockfitnessstudio.com/uploads/1/3/1/6/131606674/1f565bc5183d.pdf
    • http://xoteba.mondulkiritour.com/uploads/1/3/0/9/130969747/fde6d62ce6b14c.pdf
    • http://vesutaf.bluesailrealty.com/uploads/1/3/0/7/130738970/4546977.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5222/files/40468075951.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/nekadilafuzefimibepujoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/72691866736.pdf
    • https://cdn.shopify.com/s/files/1/0456/4857/6679/files/geninajokuti.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/83366327166.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0641/files/lamevuridexudemiko.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/13100118738.pdf
    • https://cdn.shopify.com/s/files/1/0441/0854/6200/files/wotlk_talent_builds.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7663/files/hotel_food_and_beverage_manager_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0912/files/27597336409.pdf
    • https://cdn.shopify.com/s/files/1/0432/4275/0114/files/simiwubomebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/14434905112.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_off00004364.bin
c5ff703fa36fdee7c4d1bce8240611ff77813c904658b6bb91f79d90128b9b1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4364 5596 bytes
font_01_sfnt_off00005655.bin
f5f48fcf989dd1de9f3d33dc39f79e55e4f5bb8b0c8676966fb7a49abe57ce3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5655 10008 bytes