Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba352a3ea3604bde…

MALICIOUS

PDF

42.8 KB Created: 2020-08-15 05:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f29721a933ed5f86cca00d6b91d457a6 SHA-1: 9fc22d0c9ff71b1770ba3ec953b1cda086dd3d83 SHA-256: ba352a3ea3604bde18076a119f0c3633671beb5f86051f4e079d33f1fd9347b5
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, which is also present in the document body. The link leads to a URL that appears to be part of a link farm designed for SEO manipulation, likely to obscure the malicious destination. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves tricking the user into clicking the malicious URL, which is disguised as a 'lab report writing procedure'. No scripts were extracted, but the presence of a malicious redirector and a link farm suggests a phishing or malware distribution attempt.

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.cc/pify?keyword=lab+report+writing+procedure
    • http://files.naturewalkswithbucky.com/uploads/1/3/1/4/131438366/396857.pdf
    • http://files.didntwakeupthisway.com/uploads/1/3/1/3/131379622/wofeziti_jalos.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8831/files/persona_5_battle_fiend.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/arborists_certification_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/halimbawa_ng_akademikong_sulatin_sa_humanidades.pdf
    • https://cdn.shopify.com/s/files/1/0433/6336/9125/files/viwavifosoxeresotuzo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1972/files/pariwenenola.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2635/files/95535772713.pdf
    • https://cdn.shopify.com/s/files/1/0434/2389/1618/files/3999555637.pdf
    • https://cdn.shopify.com/s/files/1/0456/4661/0599/files/livros_sobre_budismo_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/gapejubikepuriva.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/jinorajozibasilageruma.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/4646917401.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3020/files/90617426889.pdf
    • https://cdn.shopify.com/s/files/1/0438/5934/5573/files/battlefield_3_servers.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_off000069b7.bin
440c1c4c1e92bcb860f26453666c2a2aa309ebe494fee1dc1ce4ed11587ccb30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B7 5204 bytes
font_01_sfnt_off00007b87.bin
0d26fdf746a12d338ceb762f14e00b8e7572c658f3df774a4bbe8c17c8a3583b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B87 10352 bytes

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