Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8dcd39445a332a…

MALICIOUS

PDF

38.5 KB Created: 2020-08-25 19:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38ff227365e5dd80fab9cae8fee3a9d6 SHA-1: cd9905097ab14dda5edaf25ce6a61b6b12c9e14e SHA-256: 9c8dcd39445a332a956007e0c9796845c50ea5e5ac9636a29d7ea6a67170095d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, also contains the same URL, suggesting it's the primary lure. Additionally, the PDF is flagged as a link farm, containing numerous external links, many pointing to Shopify domains, likely to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=free+catholic+wedding+program+template+downloads
    • http://files.dreamcollegedisability.org/uploads/1/3/0/9/130969724/xuparoz_gesusukoje_wapasune.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/bivaniforowakomutarubes.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/fogusogizibu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7972/files/convert_torrent_to.pdf
    • https://cdn.shopify.com/s/files/1/0431/6318/9405/files/things_fall_apart_ebook_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/adjectives_prepositions_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0802/files/agile_methodology_phases_explanation.pdf
    • https://cdn.shopify.com/s/files/1/0431/3455/0177/files/33071418873.pdf
    • https://cdn.shopify.com/s/files/1/0434/3129/7185/files/92241733789.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_off0000591d.bin
329efe6b35ff3f0704efa00da31e16244ea394bc412189cac72fb6261f98828d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591D 5532 bytes
font_01_sfnt_off00006bcb.bin
9194bdff0df80cce679edf60b7b936e9807781556c3506024c87c36147c05630		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCB 9892 bytes

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