Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8afdc4269b8a42…

MALICIOUS

PDF

35.5 KB Created: 2020-08-16 20:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26127b6115bfc12a32fd6ac8e56ca17f SHA-1: 222de17556ea9c2fe2e9961f482c043d243a4a2e SHA-256: 8e8afdc4269b8a4269e90998408529e0f0b49bf62cc3844ab3a27943ea1c8893
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a form for printing personal information. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the ttraff.ru URL, which is likely used to redirect the user to a phishing or malware distribution site.

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=imprimir+curp+gratis+nuevo+formato+2018
    • http://files.colorblast5k.org/uploads/1/3/0/7/130774990/tawatul.pdf
    • http://files.theitalianbridge.com/uploads/1/3/1/4/131452803/1770890.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8131/files/form_i_730.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/batman_logo_hd_wallpaper.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/57404609782.pdf
    • https://cdn.shopify.com/s/files/1/0443/5014/4668/files/86250855097.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/babasetaxoguvivowe.pdf
    • https://cdn.shopify.com/s/files/1/0449/6100/5736/files/abrasive_water_jet_machining_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0436/1158/6722/files/learn_android_linux_command_line_shell.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/paluzajuzibosavutazemis.pdf
    • https://cdn.shopify.com/s/files/1/0439/0086/2619/files/fuwetuxezemerituv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6088/7705/files/potobebulofotukux.pdf
    • https://cdn.shopify.com/s/files/1/0438/4122/4861/files/26099318938.pdf
    • https://cdn.shopify.com/s/files/1/0435/6879/1713/files/nizapugap.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_off0000497d.bin
31ef24371298a3a738c0fd0070b41d14c8914160d0d9b84b1ab8929ace74a5f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x497D 5820 bytes
font_01_sfnt_off00005d43.bin
4b96f1205c7fbe10d30dbdeeafc387e5d49c86dc94287486bafd0117742928bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D43 10440 bytes