Malicious PDF — malware analysis report

Static analysis result for SHA-256 560ccb385d4c8039…

MALICIOUS

PDF

44.2 KB Created: 2020-08-12 08:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0cf1803be4791b22210b5fcaadbdd76 SHA-1: f3ddc8e333221031b10e5292d0176fba2de066da SHA-256: 560ccb385d4c8039a0c950106963ecd3efdd445bc23e85806527ecea86e814e5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/wb?keyword=mahendra%20guru%2010000%20vocabulary%20pdf. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially corrupted, contains the same lure text as the malicious URL, indicating a clear intent to direct users to harmful content.

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/wb?keyword=mahendra%20guru%2010000%20vocabulary%20pdf
    • http://files.mindbusterstrivia.com/uploads/1/3/1/8/131857920/7697937.pdf
    • http://files.salembrewsupply.net/uploads/1/3/0/7/130740255/073530.pdf
    • http://files.kercherbiology.com/uploads/1/3/0/8/130814687/4f2d8090f7.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/market_guide_for_communications_platform_as_a_service.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/rasegok.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/wabovetoton.pdf
    • https://cdn.shopify.com/s/files/1/0437/9928/1821/files/skmei_watch_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0440/8049/6792/files/64007621834.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/79444668910.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3183641906.pdf
    • https://cdn.shopify.com/s/files/1/0436/0978/4482/files/reruxowejulukoribibawasub.pdf
    • https://cdn.shopify.com/s/files/1/0431/0777/8717/files/54670616525.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/laxemutegekirubuvejotaru.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/lilokobegarubajawetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7967/1718/files/wodepe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/anatomy_of_earthworm.pdf
    • https://cdn.shopify.com/s/files/1/0429/7778/8057/files/xfdl_to_online_converter.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_off00005d0d.bin
45dec57dd916baeef7a3e749c814b9021a87e2506ea4684bb4edd4b4aa9fd7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0D 5740 bytes
font_01_sfnt_off0000709c.bin
1c4f8d62d7d3d0b3136689de86d8026a3f8053f1b0af0aef620a230c77eb5f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709C 9924 bytes
font_02_sfnt_off000092ad.bin
47789f527a5f89af1a335ab09a9cb107910613f841434a0c05f0ac778f80dcdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AD 4052 bytes

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