Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bd929f653a8b8c…

MALICIOUS

PDF

40.7 KB Created: 2020-08-04 05:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c3ef7ea0ce8eff95a30e21bec88bdbd SHA-1: f75de7d025907667b36a067b2fab558458acb2fc SHA-256: b1bd929f653a8b8c02e16a68cc22d3819614a8e1b6db50eec81d3b9596b4b90c
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to what appears to be a link farm designed to distribute PDF files. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is used to lure victims with a keyword search. The document body, though heavily obfuscated, contains the URL that leads to the malicious redirector, suggesting the primary intent is to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=hillbilly+elegy+pdf
    • http://files.meghwilson.com/uploads/1/3/0/7/130740493/zuditefifanavuxu.pdf
    • http://files.duhamelsomerville.org/uploads/1/3/0/8/130813095/5435361b.pdf
    • http://sebig.ngcorporatesolutions.com/uploads/1/3/0/7/130775934/zokajatagukison.pdf
    • http://files.yefeart.com/uploads/1/3/1/6/131607662/kezubofigato_vuwixamubezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2276/files/awakening_the_giant_within_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5040/1945/files/kuwijurisoludibe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/24279373620.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/jopekakego.pdf
    • https://cdn.shopify.com/s/files/1/0430/7147/1767/files/12101450856.pdf
    • https://cdn.shopify.com/s/files/1/0433/0435/3956/files/metodo_descriptivo_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/pesuwujaja.pdf
    • https://cdn.shopify.com/s/files/1/0430/0131/5491/files/dasob.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/dopevovu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1391/files/acrobat_reader_to_converter_online.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_off000061e9.bin
3159e99ea260b2eb3dc391aa41d9827228199f5f67f82511ddf653f7c98ef3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 4928 bytes
font_01_sfnt_off000072cf.bin
51aefc89a81cda9159af050371d6cc10622bd8c5096d675e1806c9df0b3b0778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CF 10468 bytes

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