Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0d131bbf5a8b7e…

MALICIOUS

PDF

35.4 KB Created: 2020-08-01 17:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e940dcb3e5acee9510a79db35fa1039 SHA-1: 3eec800324b9a061da23326810bfed7610ec8c3e SHA-256: 2d0d131bbf5a8b7e83b3a9e36afa51b552d4db643f709a8efe1797ca5f6e1137
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is further evidence of malicious intent. The document body, though partially corrupted, contains the search query 'microelectronic circuits 7th edition pdf solutions' and the malicious URL, suggesting a lure to trick users into clicking on potentially harmful 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.ru/pify?keyword=microelectronic+circuits+7th+edition+pdf+solutions
    • http://files.rocknrollreports.com/uploads/1/3/0/9/130970003/satutupab_wekira.pdf
    • http://files.harmoniousbeing.co.uk/uploads/1/3/1/1/131164312/7758010.pdf
    • http://files.smeccinc.org/uploads/1/3/0/7/130775515/xipemonunevuvoniwolu.pdf
    • http://files.diylabourpain.co.uk/uploads/1/3/1/3/131383444/7d9e88a99d5318.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/norurenogakirunanirivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4780/files/85087868015.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/16915868897.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2311/files/defaxamavubutid.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/14487521896.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/9375473325.pdf
    • https://cdn.shopify.com/s/files/1/0428/7732/1379/files/kedegiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/75658117915.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/94490461806.pdf
    • https://cdn.shopify.com/s/files/1/0434/5993/6421/files/fagimudaje.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2211/files/61067241386.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/67904514465.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_off00004cfb.bin
ea78dd378b1e36a33f1acf4850923228db3f59fc22e3d42874dc55cc21fa14b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CFB 5116 bytes
font_01_sfnt_off00005e73.bin
821e45c93c36b499af305ba1d34e3930a52fbcb0c728925477e7accbc3b352bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E73 9788 bytes

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