Malicious PDF — malware analysis report

Static analysis result for SHA-256 641edbd1be74f216…

MALICIOUS

PDF

50.7 KB Created: 2020-08-07 16:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54b01ac8a7eb9789d5dca1833bc4f4a6 SHA-1: 62c8360255ee97376829da2b1bc39831485b3e87 SHA-256: 641edbd1be74f2162deeb66d7bbd4842948c5f771947dfd3d1bafd8c4fb6785d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains a large number of embedded links, many of which point to a link farm infrastructure. One prominent link, https://ttraff.ru/pify?keyword=baroque+art+movement+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect users to malicious content.

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=baroque+art+movement+pdf
    • http://files.pgtaosa.org/uploads/1/3/0/7/130775520/32560125e006306.pdf
    • http://tifuzejiv.fritzcornmaze.com/uploads/1/3/0/7/130775320/1727470.pdf
    • http://files.carpediempublishers.com/uploads/1/3/1/3/131380213/8438239.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/39380219250.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/bapivuvevog.pdf
    • https://cdn.shopify.com/s/files/1/0438/2038/4416/files/college_football_injury_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/7408/5279/files/bufazezezodejajivuwek.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/magidoduwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4179/9843/files/tuxaruvaribumudakawone.pdf
    • https://cdn.shopify.com/s/files/1/0438/2038/4416/files/setting_up_localhost.pdf
    • https://cdn.shopify.com/s/files/1/0428/3429/6988/files/10003139382.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0632/files/30737127792.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/xefedidu.pdf
    • https://cdn.shopify.com/s/files/1/0449/7106/5503/files/azatioprina_y_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3248/5793/files/8895292979.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_off000089ff.bin
57ce10dd95e3856775f1cd61bf5041603033560eee76dfbbb64e41b11141c736
pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 5212 bytes
font_01_sfnt_off00009bae.bin
066a49375eac62521b07d51f754167af2e114b32ae65959408fc3120145256bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAE 10032 bytes