Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f4c10437eb5b43…

MALICIOUS

PDF

44.5 KB Created: 2020-08-05 10:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 423e1255bb7999d7838a304f8270bfff SHA-1: f9ffbff5975eecb2fbeeed0622dcb12899c2b600 SHA-256: 22f4c10437eb5b4318f114a63e6b5f022cd3bf8dbc7ae9cd93ed92758527b844
128 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body text, though heavily obfuscated, contains the phrase 'Gate 2020 ee question paper pdf' and the malicious URL, suggesting a lure for exam-related content. The primary malicious URL is ttraff.ru, which is known to host redirectors. Several other URLs point to Shopify, likely used to host decoy PDFs.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gate+2020+ee+question+paper+pdf
    • http://files.orfeonportuense.com/uploads/1/3/1/4/131453329/833a7ce6844.pdf
    • http://files.ayrshirejudoclub.co.uk/uploads/1/3/1/8/131856166/wuwaxati-girud-kesalunag-setinojamux.pdf
    • http://files.kentuckycattlemensbeef.com/uploads/1/3/0/7/130776656/xonetedakiso.pdf
    • http://files.eratoalakiozidou.com/uploads/1/3/1/0/131071277/5dc7eb897eab6f.pdf
    • http://dopabir.pickmuseumhmongexhibit.org/uploads/1/3/1/4/131454106/vobidibul.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/dabenuronudofiwuxotoxil.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/silokudabem.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/bokemegilezitakozozalaled.pdf
    • https://cdn.shopify.com/s/files/1/0437/4754/1146/files/atlas_v14_download_hongfire.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/85848992831.pdf
    • https://cdn.shopify.com/s/files/1/0429/0428/9439/files/react-_router-_dom_link.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/elaborative_rehearsal_involves.pdf
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/46291140714.pdf
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/98158850189.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/roxipoxizenefosapis.pdf
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/practical_biochemistry_mbbs.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/77058187664.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_off00006e93.bin
68f8a0e350bb7dfa0bf4b8fe8c76d640d779fd390930568e386d39b3d1b6f018
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E93 5432 bytes
font_01_sfnt_off0000811b.bin
ea4185f75392a657490e0862363ddfa8fc2563014bb1dc5ff54bea16247c4271
pdf-font-stream PDF embedded font (sfnt) at offset 0x811B 10540 bytes