Malicious PDF — malware analysis report

Static analysis result for SHA-256 52961993fdd82b21…

MALICIOUS

PDF

55.5 KB Created: 2020-08-01 22:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1645d3d5da8c9d6a005ae611a082fe7 SHA-1: 055f577fc5518ea15befa31a544efb4c8c742ecc SHA-256: 52961993fdd82b212d5fcb4129fa0521f6763c4102a9dcbd3d068770c881d18e
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link to 'ttraff.ru' which is designed to host HTML content on GitHub. The document also features a large number of external PDF links, many hosted on shopify.com, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL points towards a phishing or scam attempt.

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.ru/pify?keyword=host+html+on+github
    • http://files.aquanautsdiveadventures.com/uploads/1/3/0/7/130739456/xomoxaduwisobo_retepudi_favogis.pdf
    • http://files.mingzhixu.com/uploads/1/3/1/4/131437770/6377881.pdf
    • http://files.corruptcarbonworks.com/uploads/1/3/1/8/131856917/b170afa.pdf
    • http://files.prairiedusttrail.com/uploads/1/3/0/8/130813799/kivaw_guxipepuvupa_diwevozavexitex.pdf
    • http://files.mrs-macs.com/uploads/1/3/0/7/130775934/pugujetewevenid-nokapigu-tenadofafexir.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/74294600629.pdf
    • https://cdn.shopify.com/s/files/1/0437/0622/0697/files/nafobotopupunuwet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xagene.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/sakabixorubekawoku.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/tefopakeluzajif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3062/files/77322400733.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/92076644937.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/xubafobejoxuz.pdf
    • https://cdn.shopify.com/s/files/1/0435/1485/5583/files/disikawekuvunuwanoxidej.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5975/files/kijibopomavevomim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/genozijelazukuwogukevuwag.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/16466177553.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/deputekimepozoma.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e25.bin
e56066d0abf73c7f3ab31179bf4ae3b08ab9f70a3078c5099254945d23fcbc59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E25 4896 bytes
font_01_sfnt_off00009eaa.bin
584e35af7f4d5c23bfab2286cd5d829f56cfea48f2b9777fa30cee6a65c18dfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAA 16076 bytes

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