Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d21279a5513910…

MALICIOUS

PDF

33.3 KB Created: 2020-08-24 21:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec08b018e936bd9cb2f454bb2580b7b6 SHA-1: 8802e0b1ef43eded3e51f3f0833d1f87cdafb6b6 SHA-256: 85d21279a55139109b4a28f82696206d6d37b3a31432ff37b23b2e0574fdee5c
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.com, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, appears to contain the same URL and a list of other URLs, many hosted on Shopify, likely as part of a link farm or to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or redirection scheme.

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.com/pify?keyword=mandated+reporter+pa+university+of+pittsburgh
    • http://files.allseeingeyedesign.com/uploads/1/3/1/8/131871740/jojadetudexu-dupotagu-furoxatosuw-dowiwek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5392/2981/files/49785486284.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/nugofejujako.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48465164240.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/andis_clipper_blades_guide.pdf
    • https://cdn.shopify.com/s/files/1/0448/2806/5949/files/big_file_to_word_converter_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/zokiwonutuboxeked.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/worutij.pdf
    • https://cdn.shopify.com/s/files/1/0438/2274/3712/files/niforipesatamonajikoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5747/8809/files/97314531609.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/75221016786.pdf
    • https://cdn.shopify.com/s/files/1/0437/7739/2791/files/82851719806.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_off00004459.bin
de0195fc7026d768849dcbd1af78c92c5685c65403b943195d7de5c27e6a9532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4459 5576 bytes
font_01_sfnt_off00005750.bin
5b706db5cdc6dd664877ad1572d4098a64776ea933f9a79aef5a5867c70b845a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5750 9732 bytes

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