Malicious PDF — malware analysis report

Static analysis result for SHA-256 786ed542c2b17ef4…

MALICIOUS

PDF

67.4 KB Created: 2020-08-21 17:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e82854401073f823f3055551310b9625 SHA-1: 8ceae0ebe2c1501a14c293030980eacc67abcfc2 SHA-256: 786ed542c2b17ef48f0e3d0da6f3cde40ccb092dd391049f31db8203ffa3dd4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure (https://ttraff.cc/pify?keyword=cahiers+du+cinema+2018+pdf), indicating a malicious intent to redirect users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=cahiers+du+cinema+2018+pdf
    • http://bewogik.krutschworks.com/uploads/1/3/1/3/131398101/tororunemawep-mekif-diraxemijoruto.pdf
    • http://files.pauline-west.com/uploads/1/3/2/7/132712120/7328106.pdf
    • http://files.palmislandestates.org/uploads/1/3/0/7/130775490/cd7e1dcf4fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/3207/3624/files/bohemian_rhapsody_sheet_music_violin.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/62320895285.pdf
    • https://cdn.shopify.com/s/files/1/0437/1241/3847/files/reliability_theory_and_practice_bazovsky.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/77133495553.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/maruvitumiselaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/40895354382.pdf
    • https://cdn.shopify.com/s/files/1/0438/1625/5645/files/piriformis_muscle_stretcher.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/kitudulubomewajovove.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/nigeria_customary_law.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/wejujedopobuzuwezinu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7008/7587/files/fudib.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/tabulurunovubugirebomege.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/biblical_names_and_meanings.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_off0000bd9d.bin
9acd28f73038b31e4027bd86e49646b63484a0330c89abbe4d25e7ad7bfd47bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9D 5788 bytes
font_01_sfnt_off0000d128.bin
72ea7c03a07f09586e60ac741944c7299374f3d7fe1a423f1a86286ff12baa6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 15536 bytes

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