Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fd7956ad517db0…

MALICIOUS

PDF

46.8 KB Created: 2020-08-07 17:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b03e9e517573c742509cac3cb7e0016 SHA-1: bcfc495a01bf53441272929207bed647faf37d76 SHA-256: 23fd7956ad517db042221c87b9b2c1afebe3e635f69be526188e367a4e68b12b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL, https://ttraff.ru/pify?keyword=mastering+bitcoin+unlocking+digital+cryptocurrencies+pdf+download, is presented as a lure for a PDF download. The document body, though heavily obfuscated, contains this URL and other links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer the 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.ru/pify?keyword=mastering+bitcoin+unlocking+digital+cryptocurrencies+pdf+download
    • http://files.kitchenideascookshop.co.uk/uploads/1/3/0/9/130969885/momofomuvu.pdf
    • http://files.onlinerehabilitation.org/uploads/1/3/1/0/131071037/45f7b.pdf
    • http://files.mastersextoys.com/uploads/1/3/0/8/130873930/lopegumefilatul_pavabil_vozatetaxa_ribuxeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/davixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/88102818952.pdf
    • https://cdn.shopify.com/s/files/1/0433/0999/0043/files/gasix.pdf
    • https://cdn.shopify.com/s/files/1/0432/6516/3422/files/certificato_anamnestico_per_patente.pdf
    • https://cdn.shopify.com/s/files/1/0428/7443/7791/files/34208826228.pdf
    • https://cdn.shopify.com/s/files/1/0437/5016/2583/files/72795196954.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jedufejaselikaruratemop.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6381/files/notawedeto.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/62876154584.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/tanesereloleromedilup.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/93854290413.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/99252460854.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/29017287458.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/28447678823.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_off000076ed.bin
0d49c20d3abb7df5e69dd83487b66467ca44bab7911ff76c83719c5b197ee7ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76ED 5724 bytes
font_01_sfnt_off00008aa0.bin
e6bc9a362e3201067ca1a9172ec4699f9855f29e4247cdd73b409adedd77976b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA0 10260 bytes

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