Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c55877b2c4c27ce…

MALICIOUS

PDF

38.3 KB Created: 2020-08-07 08:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 363416440adb243b778aac6fbd0b0258 SHA-1: 37624b0e9ec7efffcfc31505b4dcb3dfd9267f9b SHA-256: 6c55877b2c4c27ce036b0ab52701957f9a6c1a235dea1e14f95c13c66d30c088
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits a mass external PDF link farm, with many links pointing to Shopify. The primary malicious URL identified is ttraff.ru, which is likely used to funnel victims to further malicious content. The document body, though heavily obfuscated, contains this URL and other PDF 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=bonhomme+allumette+pdf
    • http://files.footballinmyblood.com/uploads/1/3/0/7/130740051/722c1.pdf
    • http://files.exsanguinationsignet.com/uploads/1/3/2/7/132712483/bogululuvaxafogime.pdf
    • http://files.tobeman.net/uploads/1/3/0/8/130813887/35ff2d7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2220/5607/files/balanceamento_de_equaes_redox.pdf
    • https://cdn.shopify.com/s/files/1/0437/8358/5949/files/accidente_de_trabajo_imss.pdf
    • https://cdn.shopify.com/s/files/1/0437/6523/5866/files/ffxi_how_to_change_screen_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/textbook_of_medicinal_chemistry_alagarsamy_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0655/8359/files/boxikefixumiwijopoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/zygmunt_bauman_liquid_love.pdf
    • https://cdn.shopify.com/s/files/1/0434/7183/1193/files/92161457704.pdf
    • https://cdn.shopify.com/s/files/1/0431/8455/4135/files/rajorejilemelon.pdf
    • https://cdn.shopify.com/s/files/1/0431/9520/3745/files/51472832071.pdf
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/93182058308.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/32756944955.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059d2.bin
0477e921f1469dd00855a1714f0465c2a9d0ebbe3629d817cad13d717e25cd44
pdf-font-stream PDF embedded font (sfnt) at offset 0x59D2 5056 bytes
font_01_sfnt_off00006ae5.bin
8a1dbd47377aea1f429bd52a01ed274934a0121e44c47fd970a141f0e71aaa1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE5 9864 bytes