Malicious PDF — malware analysis report

Static analysis result for SHA-256 d906e71f5de5f602…

MALICIOUS

PDF

50.9 KB Created: 2020-08-08 20:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e9cd61f4a7cfecdb985dace36915ac5 SHA-1: e4f39009a592f19bfb603af871d6fe18cdc6af19 SHA-256: d906e71f5de5f6021f4d195d5e856eee85eb66d4c45f076deb57c5c5b83c4821
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains text suggesting it is a lure for an 'academic writing course syllabus'. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it is a redirector and part of a link farm. The primary IOC is the malicious redirector URL.

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=academic+writing+course+syllabus+pdf
    • http://files.paragonmedia.tv/uploads/1/3/1/8/131871390/tepivoruf-zasavejefam-zufafugod.pdf
    • http://files.sacredselfsacredsource.com/uploads/1/3/1/8/131871907/sanukewasat.pdf
    • http://files.murrayseniorcenter.org/uploads/1/3/2/6/132681985/78d069da6d.pdf
    • http://files.stdympnas.com/uploads/1/3/2/6/132681479/1494527.pdf
    • https://cdn.shopify.com/s/files/1/0434/5479/1832/files/85771034780.pdf
    • https://cdn.shopify.com/s/files/1/0446/7766/0825/files/cadence_virtuoso_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1426/files/disuxupifupexafimafog.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/myred_unl_login.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/amino_acid_metabolism_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/33_media_tumblr_gif.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/pexositasowemimazakofatip.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/belezisabojapogozafe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2776/files/67794324642.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/88130193849.pdf
    • https://cdn.shopify.com/s/files/1/0451/4965/1098/files/defensa_siciliana_alapin.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_off00007807.bin
15da2e8d7e8df0c1d2fc0eb52d9cebdf9d75bb8faa7062a162fd1bc4ec7e0e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7807 5680 bytes
font_01_sfnt_off00008b4c.bin
210d46d821305cefd5df37e75f6a90345e68f93ac7ee726679c78ec12fb56fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4C 10972 bytes
font_02_sfnt_off0000b093.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 4324 bytes

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