Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a25b46da5dc346a…

MALICIOUS

PDF

51.5 KB Created: 2020-07-24 23:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fadc2c4b9052f434dd41e6964096a8c8 SHA-1: 6222a7c69b6a99ba2e109f93bfa0d309a7a3a6ba SHA-256: 1a25b46da5dc346a9013db463c6ce548e1664f41719e3193ad5d1f75f0a26a9e
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. The primary malicious URL identified is ttraff.ru, which is known for redirecting to malicious content. The document body is heavily obfuscated, but the presence of 'Ajith rohana colonne books pdf' suggests a lure related to book downloads. The ML classifier also strongly flagged this PDF as malicious.

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=ajith+rohana+colonne+books+pdf
    • http://files.anazaofitnessgear.com/uploads/1/3/1/3/131379828/5312962.pdf
    • http://files.centralhauling.com/uploads/1/3/0/7/130775747/8796f68b077526.pdf
    • http://files.somonaukfire.org/uploads/1/3/2/6/132695329/misisiba.pdf
    • http://files.uhighmusic.com/uploads/1/3/1/4/131406604/4a8de49f.pdf
    • https://cdn.shop
    • https://cdn.shopify.com/s/files/1/0434/6652/2790/files/mudidovulamulufufiroluta.pdf
    • https://cdn.shopify.com/s/files/1/0428/9963/6390/files/tatemiwejejukom.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/13874455587.pdf
    • https://cdn.shopify.com/s/files/1/0435/1403/6376/files/xorozuzidowejalezufokem.pdf
    • https://cdn.shopify.com/s/files/1/0431/0951/5413/files/74967608029.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66179678401.pdf
    • https://cdn.shopify.com/s/files/1/0440/7649/9096/files/78334811799.pdf
    • https://cdn.shopify.com/s/files/1/0433/2870/0571/files/ragarexikezinaneg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0433/8089/9989/files/jajok.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0554/files/sejofumox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a91.bin
294c8c30fa9d1e6b6147622b03238e06d8658b3bd2f1b624c85e3114481349c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A91 5300 bytes
font_01_sfnt_off00006c41.bin
f9ed26e6508eac79d1265e69d3ada65404534fd2c882ef5290ed51e53e7bd758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C41 21028 bytes
font_02_sfnt_off00009ed5.bin
960c8e84cec95b459b11b4047f45242301da0375446ff15004a3599d1535d6d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED5 10064 bytes

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