Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1465fc4829c93d7…

MALICIOUS

PDF

45.2 KB Created: 2020-08-08 16:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d747c94be6fe2eefc096cd9ffed45936 SHA-1: 996620d57c1152a0ba643c3853cb22bf3a98f867 SHA-256: a1465fc4829c93d7fa59cd389c90d2bcce058327112ce0cd6485ad58304b5dc5
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.com/pify?keyword=effectiveness+and+efficiency+pdf', which is flagged as malicious. The presence of numerous external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier strongly indicated maliciousness.

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=effectiveness+and+efficiency+pdf
    • http://files.spoonful-osaji.com/uploads/1/3/0/7/130775163/wuzag.pdf
    • http://files.marylanddressage.org/uploads/1/3/2/6/132683334/6639078.pdf
    • http://files.artistmelindabeck.com/uploads/1/3/2/8/132815054/73ed2bacd987.pdf
    • http://files.trialinnovations.com/uploads/1/3/0/7/130775668/8254329.pdf
    • https://cdn.shopify.com/s/files/1/0433/8391/4654/files/dugijefofuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/64944630877.pdf
    • https://cdn.shopify.com/s/files/1/0433/0723/7531/files/pevobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6510/files/rulasegedosufem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/rorumuvezitaduf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4896/8100/files/34625794270.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/turesidefonewag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8969/files/planning_california_gym.pdf
    • https://cdn.shopify.com/s/files/1/0435/1721/4874/files/17356249455.pdf
    • https://cdn.shopify.com/s/files/1/0440/8868/8790/files/ponajalepolezupexelegexu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/miralobojuwizasigubofo.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_off000069e0.bin
eec2311198495a4bc353016469730966835d49679daeed18a98faa9ab15954d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E0 2828 bytes
font_01_sfnt_off000073ea.bin
e3856985b82ee87c9089f8cc499bbb0e38b9c53f14d6f694be80e30dde2b9070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EA 5140 bytes
font_02_sfnt_off0000859a.bin
5203ebd28613b0522d28d9fe0c244cbbaaa8c2432474e8ca359c6b6fcaf4642a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x859A 9908 bytes

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