Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d95c6a32785dd8…

MALICIOUS

PDF

39.0 KB Created: 2020-08-11 00:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b32d15cf38e77646565d9483d50c38d1 SHA-1: ce3c2ea1edbcd018de6e59ac0d5241c7671d566c SHA-256: b3d95c6a32785dd8490313d227ac039ea5478cb3755f720653b5303f0bfb3bb7
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a link to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=materiales+isotropicos+pdf' which is flagged as malicious. Another heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, suggesting a link farm designed to attract traffic or distribute content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=materiales+isotropicos+pdf
    • http://files.danberkey.net/uploads/1/3/1/4/131453823/jolego_memux_puzalemozotil.pdf
    • http://radiwi.gemwomen.org/uploads/1/3/0/7/130740072/6609032.pdf
    • http://files.lakesideopenbible.com/uploads/1/3/0/9/130969470/4857133.pdf
    • http://files.mirchaiya.com/uploads/1/3/0/8/130814329/3d6299288222.pdf
    • https://cdn.shopify.com/s/files/1/0437/2358/7736/files/menejek.pdf
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/luresazamodapexoruwer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/number_format_php.pdf
    • https://cdn.shopify.com/s/files/1/0438/2484/0861/files/ley_de_arbitraje_en_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0433/4210/2679/files/how_to_play_backgammon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/good_manufacturing_practice_gmp_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/wuliginilikenovorojuda.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/vurefejaxokenivug.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/lotujurobomeputadogeles.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/23881026512.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/767611992.pdf
    • https://cdn.shopify.com/s/files/1/0428/9799/7991/files/85229930343.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1421/files/reproduction_in_amphibians.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/sebojogoxunisuvu.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_off00004fe2.bin
1004a63211599c7331ee30ebf7b9371ec7390d89e6e9c77accc35c2311364350
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE2 4836 bytes
font_01_sfnt_off00006065.bin
448e9002cbae24fb2be613ab154317c2195f1926449eff51ffcd5801b0cdba61
pdf-font-stream PDF embedded font (sfnt) at offset 0x6065 9572 bytes
font_02_sfnt_off00008111.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8111 4324 bytes