Malicious PDF — malware analysis report

Static analysis result for SHA-256 621525f966f6f6b8…

MALICIOUS

PDF

48.0 KB Created: 2020-08-16 00:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e69852ed0ab841a301fee6c31372d3ea SHA-1: a049bdfdc98bc549cb112b8dbf65ea2e368c1b7b SHA-256: 621525f966f6f6b8185020fdbafa2426f25f91bc4a41a936d06da2cf3707450e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with many pointing to Shopify domains hosting seemingly benign PDFs, but also includes a critical link to a known malicious redirector at 'ttraff.com'. The ML classifier strongly flagged this PDF as malicious, and the heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm. The presence of the malicious redirector suggests an intent to lure users to harmful sites.

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=cara++video+di+proxy+browser+android
    • http://files.franklincountyhypnosis.com/uploads/1/3/2/8/132813998/1e70760.pdf
    • http://files.thbeautytherapy.com/uploads/1/3/1/4/131410158/ec3e72414.pdf
    • http://files.wilkersonhomesinc.com/uploads/1/3/2/6/132681536/a3b633973fb2.pdf
    • http://files.leonardoko.com/uploads/1/3/1/8/131871518/ae746db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7000/4126/files/fundamentals_of_argumentation_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2054/files/78596951071.pdf
    • https://cdn.shopify.com/s/files/1/0434/8461/0712/files/zubuxamuvikidakipubus.pdf
    • https://cdn.shopify.com/s/files/1/0428/8223/6572/files/warujaxotasijigoruj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/36127043874.pdf
    • https://cdn.shopify.com/s/files/1/0432/3485/3021/files/69679127390.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6048/files/tuvufimazokomilojotokuza.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/baguminitojagomod.pdf
    • https://cdn.shopify.com/s/files/1/0431/1187/4716/files/andhra_bank_account_statement.pdf
    • https://cdn.shopify.com/s/files/1/0437/6389/2376/files/43703912728.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6570/files/80301345460.pdf
    • https://cdn.shopify.com/s/files/1/0437/3377/8597/files/jazufiropisoxazelibu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3767/1075/files/dikokotarani.pdf
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/bematofomakazanaga.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ab3.bin
88970fd55d33580a83399015e51b3c6ad41d2767e6cd9614281da440d2e035eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB3 5288 bytes
font_01_sfnt_off00008cd4.bin
d177fa702545b227880870eddbd7103e500c0d8b40371e5320a81d26ff8d6536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD4 11076 bytes

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