Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d620839d497fcf6…

MALICIOUS

PDF

113.9 KB Created: 2020-08-08 21:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36297990ed336d5ea57d94a0ba9403d9 SHA-1: a2408ab4fe227365eab6ea407c48e13cbfde2bf8 SHA-256: 8d620839d497fcf6ac796e39833a0c7798c0832ee9aa5ea4f0c85f434dada7d2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at https://ttraff.com/pify?keyword=uncle+tom+s+cabin+text+pdf. This suggests the document is designed to redirect users to malicious content. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO manipulation tactic to distribute malicious content. 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.com/pify?keyword=uncle+tom+s+cabin+text+pdf
    • http://files.taylorbrothers.org/uploads/1/3/1/4/131407423/218196.pdf
    • http://files.syandash.co.uk/uploads/1/3/0/7/130739688/12204bc37034a3e.pdf
    • http://files.nicolemillersandiego.com/uploads/1/3/2/6/132682040/gofunomujepiluv.pdf
    • http://files.hsartinc.com/uploads/1/3/1/4/131414743/d0591f46d.pdf
    • http://files.sherwoodfootball.org/uploads/1/3/1/0/131070612/ee02c901e2e.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42632515291.pdf
    • https://cdn.shopify.com/s/files/1/0429/1782/2620/files/70822043656.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/12463157706.pdf
    • https://cdn.shopify.com/s/files/1/0434/5636/4709/files/revamoduk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/tunemevisomanemuremel.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/40068147641.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/rimazexa.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/novobajulo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5687/1062/files/1323968028.pdf
    • https://cdn.shopify.com/s/files/1/0432/1781/3661/files/76131689863.pdf
    • https://cdn.shopify.com/s/files/1/0435/0512/3493/files/11639047870.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/lafokadixaxu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7235/4459/files/pozalujugibabakelekizi.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_off00017696.bin
cd59c79f167170f2e99040c4683ba99bc22fb25d773d36ac4c1af1599376923c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17696 5192 bytes
font_01_sfnt_off00018825.bin
ddfe95b8d6924c5b1e76ba9842ce9a025db8da9a36df36188da2e36f30107c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18825 10508 bytes
font_02_sfnt_off0001ac25.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC25 4324 bytes

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