Malicious PDF — malware analysis report

Static analysis result for SHA-256 567b8fee95919731…

MALICIOUS

PDF

35.8 KB Created: 2020-08-22 09:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6acf524b13b323355bedf40d120e2b6 SHA-1: 61965d0957ee1156cd9ce68a5474ce8b3988aada SHA-256: 567b8fee95919731e5a028e6845eaf61430ed16698fb45deffd8e9be3f7a789b
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting a phishing or redirection attempt. The presence of a large number of external PDF links further supports the attack pattern of a link farm designed to distribute 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.com/pify?keyword=iliamna+air+guides
    • http://files.allstarclean.org/uploads/1/3/1/3/131398428/bumawaki-manexuku-zegadixo.pdf
    • https://cdn.shopify.com/s/files/1/0447/4689/9607/files/www_pravda_sk.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/dikuxivubosedevedudo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/klb_biology_book_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/2213/9041/files/biremupamoxojumedugek.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/dufopaxajamoroxanuzomo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4098/files/sazis.pdf
    • https://cdn.shopify.com/s/files/1/0439/3749/7243/files/vinelafobozijajugeruj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/rur_karel_capek_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/kenmore_washer_series_500.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42386580717.pdf
    • https://cdn.shopify.com/s/files/1/0430/9388/5089/files/xuguse.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_off00004cf9.bin
64a6c1b818579c58500a2b74d6fcc52209744099267add6b83fb378eb1b45561
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF9 5080 bytes
font_01_sfnt_off00005e1c.bin
ac22decbec8bee6e4207ecf1bdb01ca4edfc1eade31f4ccaa8233357a2627a34
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1C 11000 bytes