Malicious PDF — malware analysis report

Static analysis result for SHA-256 71950661f46f7d0c…

MALICIOUS

PDF

62.9 KB Created: 2020-08-07 06:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29b0714665b3fe1052d80bc476e3be92 SHA-1: 4a7956d87304cc85391d04424ea592174fa87624 SHA-256: 71950661f46f7d0c0a386507b80274863aa7d9f6dd1c7540379a11f352e7062c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting a spam or SEO-poisoning campaign. The presence of a 'download button' lure further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=vert+shock+pro+pdf
    • http://kikel.orangeblossombooks.com/uploads/1/3/0/7/130739616/f575a2efb1.pdf
    • http://files.sjrathreekeys.com/uploads/1/3/2/3/132303131/vilimu.pdf
    • http://files.spotteddots.com/uploads/1/3/1/4/131437765/6033270.pdf
    • http://files.katemathiasauthor.com/uploads/1/3/2/8/132814071/buzajawotagir_tixepe_vaxelixuzuj_sololediwatux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/pivasexizelazokigov.pdf
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/how_do_you_reset_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0427/7764/1116/files/metuvi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8991/0165/files/marketing_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/motisafobuvefazi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/52814434736.pdf
    • https://cdn.shopify.com/s/files/1/0434/3054/3512/files/76164194296.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/53833824887.pdf
    • https://cdn.shopify.com/s/files/1/0429/2447/4531/files/2439561710.pdf
    • https://cdn.shopify.com/s/files/1/0431/0918/7750/files/25410135812.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1304/files/17436713836.pdf
    • https://cdn.shopify.com/s/files/1/0435/6292/6229/files/rojutegejupasaxubebuti.pdf
    • https://cdn.shopify.com/s/files/1/0439/2864/9896/files/kivar.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_off0000b8a7.bin
75b0dcfb2899ce08c7f10863e779a3c214f67f2d9da8dd095c0d2c1260a17e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A7 5032 bytes
font_01_sfnt_off0000c9ca.bin
1a70fd0177521ec116b596cf4f10dad7cd3c611f553c7150de94a7b0f4c14bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 10808 bytes

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