Malicious PDF — malware analysis report

Static analysis result for SHA-256 dffe2ef827add2d6…

MALICIOUS

PDF

47.7 KB Created: 2020-08-05 02:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ca488a2425bebcc6fd45e664e796a1 SHA-1: aa9e27dfaed23298e2a1bfbf4b0171c4e2c62608 SHA-256: dffe2ef827add2d6f1d7e89efae72d075cde173e719a2aad1d5b3332a4810a43
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and other embedded URLs, suggesting a lure to external malicious content. The presence of a PDF link farm heuristic further indicates an attempt to distribute malicious content disguised as legitimate documents. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=emotional+development+theories+pdf
    • http://xirijexe.lucybellesrainbow.org/uploads/1/3/2/7/132741334/banepafemab_defugana_savofakeb.pdf
    • http://files.esibstudentsfront.com/uploads/1/3/2/6/132695749/50518ed8a82.pdf
    • http://files.yorkshirecheesestall.com/uploads/1/3/0/8/130813782/fijefememixi.pdf
    • http://files.retrogamergear.com/uploads/1/3/1/1/131164239/8049275.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/57650291473.pdf
    • https://cdn.shopify.com/s/files/1/0446/6468/4697/files/cambridge_igcse_physics_workbook_2nd_edition_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/62580553264.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/49243564259.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/disadvantages_of_globalisation.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86556218032.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7074/files/29254074509.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/freeshop_latest_version.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7806/files/vulew.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/cathflo_activase_instructions.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_off000070db.bin
1b1da0eb38ca416d2780e5dc60dec3ae0eb32737d220b77c7a985490e68269d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DB 5088 bytes
font_01_sfnt_off000081f2.bin
7ca6828055a4255b097deb8c92c880573d30b34d28092ede7f49b7f5575d3fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F2 9860 bytes
font_02_sfnt_off0000a3a2.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A2 4324 bytes

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