Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ff0dfac6ee666e…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 03:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed847def911b44b2e5406d968d2f83c8 SHA-1: efb9405f89ada5a4c4436a495d1040da806b6b6e SHA-256: a0ff0dfac6ee666e5f3a490aea06c25a88e51f85633b75393ccd13e920f00e2e
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.cc). This indicates a link farm strategy, likely intended to obscure the final malicious destination or to distribute malware. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious content. While no scripts were extracted, the heuristic firings and embedded URLs strongly suggest a malicious redirection attack pattern.

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.cc/pify?keyword=cammy+street+fighter+android+wallpaper
    • http://files.communitychristianaugusta.com/uploads/1/3/0/7/130775649/a39153d5a.pdf
    • http://files.poseidonwater.com/uploads/1/3/2/6/132682790/vevogapejud.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/23171319707.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/5127665341.pdf
    • https://cdn.shopify.com/s/files/1/0428/4507/7671/files/name_reactions_in_organic_chemistry_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/alternate_angles_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/wazaridasesini.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/jofatigasenoxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/35150745654.pdf
    • https://cdn.shopify.com/s/files/1/0429/1746/2182/files/ygdrasil_jorge_baradit.pdf
    • https://cdn.shopify.com/s/files/1/0440/5824/7320/files/digestive_system_ppt.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_off00005bb7.bin
77571904afb2cc68f250afe2bcb4ab2743b693fad00d63e92a50a71c0930451f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB7 5552 bytes
font_01_sfnt_off00006e8c.bin
ca0ac086523401c3a5c2f95e0172d99e3e9c56f65c39c3a86ce43934ac9c8f14
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8C 10156 bytes