Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd09b6d828fc301a…

MALICIOUS

PDF

47.8 KB Created: 2020-08-11 19:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0931b740764b57e0a2b54c35fc1b86b2 SHA-1: 1611128c41aae3e564880bfb99e29c29591f0d7f SHA-256: bd09b6d828fc301a84363754ce2694013739d266fec3d3f052812c5aad53fc1b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm with numerous embedded URLs, including a critical redirector link to 'ttraff.ru'. This indicates a phishing or malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=area+and+perimeter+of+a+circle+worksheet+pdf', suggesting a lure related to educational materials.

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=area+and+perimeter+of+a+circle+worksheet+pdf
    • http://files.gardenofhealingmt.com/uploads/1/3/2/3/132302855/warozerakis.pdf
    • http://files.lakedevonshirehoa.com/uploads/1/3/2/7/132740723/502863.pdf
    • http://files.counsellingpsychologist.services/uploads/1/3/0/9/130969555/7582248.pdf
    • http://files.niscmun.org/uploads/1/3/1/4/131407233/543081.pdf
    • http://files.vegansxm.com/uploads/1/3/2/7/132740925/japajewaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/digital_marketing_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/11991459003.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/brown_bear_brown_bear_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/zopijomefowokufelodorunud.pdf
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/71971885553.pdf
    • https://cdn.shopify.com/s/files/1/0428/3265/8588/files/96039497008.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/nodud.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/94626925656.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/36083673245.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/22847259046.pdf
    • https://cdn.shopify.com/s/files/1/0436/1817/3086/files/67331825668.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/rodexokobada.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_off00007be4.bin
20eae544df8773da875211537bd8c41e49ef1576fd7088e681e289773ed87991
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE4 5540 bytes
font_01_sfnt_off00008e9f.bin
e3b29d1971b39e14e161474a62c5911a9b3e8bda3b385ab7842f681e45d80be7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9F 10328 bytes