Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8727ad00ec2d652…

MALICIOUS

PDF

51.2 KB Created: 2020-08-07 18:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 101cb63bb58941916c49dee01e24d90f SHA-1: 30b3807fd1d79dbfb919dd5eec9a70f590edc726 SHA-256: e8727ad00ec2d6524c8254d3ee4fe75662ee4f5b0c2fb87a00099881f0b1de51
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm. One critical heuristic identified a redirector link to 'ttraff.com' with a keyword suggesting a lure for exam-related documents. The ML classifier strongly supports the malicious nature of this PDF. The primary attack vector appears to be directing users to malicious or deceptive content through a network of links.

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=bank+clerk+exam+questions+and+answers+pdf
    • http://files.tariqahalkaamilah.com/uploads/1/3/1/1/131163620/nitedawoxedusus.pdf
    • http://files.spiralpathpilgrimages.com/uploads/1/3/2/7/132740264/8066361.pdf
    • http://files.rosconvent.ie/uploads/1/3/1/8/131856456/892f6ad5da3782c.pdf
    • http://files.renzoeats.com/uploads/1/3/2/7/132741385/firaduduv.pdf
    • http://files.airavi.net/uploads/1/3/1/3/131381316/97487b3e.pdf
    • https://cdn.shopify.com/s/files/1/0433/6317/2502/files/dixokekixa.pdf
    • https://cdn.shopify.com/s/files/1/0439/3644/8667/files/61926087257.pdf
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/mine_sweeper_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/communication_skills_and_soft_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/midea_rice_cooker.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6648/files/luvatopusofogodomujop.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/bihar_river_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/6059/1776/files/laliberuwogawawetako.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/sasarefelexenenebekilubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/kozadedaxox.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/47103724386.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072e2.bin
12f325bcb1c067b10521874154cd840a88548e246104e67dafd0f9b9060d1ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E2 5584 bytes
font_01_sfnt_off000085cf.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85CF 1800 bytes
font_02_sfnt_off00008e5d.bin
93dee7e1b2b8734d138c57cec27b88d1872739a3c1b33b85b1f5355e136d3f8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5D 10176 bytes
font_03_sfnt_off0000b100.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 4324 bytes

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