Malicious PDF — malware analysis report

Static analysis result for SHA-256 f104870fb295b91d…

MALICIOUS

PDF

38.5 KB Created: 2020-10-28 00:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d73518af481f98b60e2d91e0fb33d83 SHA-1: 9a3ff72d5d281a3edbebeb32d7c7b1cb30980733 SHA-256: f104870fb295b91dbbb664b3aa1a9fa99b5edebe163a56bdaf3bd1fddf0e279d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to product searches and URLs, suggesting a lure to entice users to click the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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://cctraff.ru/strik?keyword=cuisinart+charcoal+water+filters+dcc-rwf-12
    • https://cdn-cms.f-static.net/uploads/4408713/normal_5f957c6250a3e.pdf
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f87d8d0d083d.pdf
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5f989ec5e57c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b57b866d-b73c-4d01-b088-b964a96e3f7c/28229612343.pdf
    • https://uploads.strikinglycdn.com/files/f99bbb92-1cf1-43aa-8028-f6ce89991ff0/fagopexikijopagum.pdf
    • https://uploads.strikinglycdn.com/files/78604b5c-d4a5-4595-83c9-daf8a340006f/spyro_attack_of_the_rhynocs.pdf
    • https://uploads.strikinglycdn.com/files/ef9e99b3-4065-4e70-b1aa-cb38399b1675/81589458015.pdf
    • https://uploads.strikinglycdn.com/files/fd86fac0-38ae-439b-82ba-c4e31117c54c/44730610888.pdf
    • https://uploads.strikinglycdn.com/files/ef972899-a2de-4910-9e84-6f33c53ead58/23154947407.pdf
    • https://uploads.strikinglycdn.com/files/f05cbd9d-106c-41b5-b44b-976a21492ab9/oraciones_subordinadas_adverbiales_propias_e_impropias_resueltas.pdf
    • https://uploads.strikinglycdn.com/files/dfc3bc35-bccd-4138-8532-271f47129987/83872217955.pdf
    • https://uploads.strikinglycdn.com/files/da957fba-ac12-41be-915f-510d47abda3b/winizutuwo.pdf
    • https://uploads.strikinglycdn.com/files/9390b0eb-dcd0-4dfa-ad42-af682818595b/pavuwebugir.pdf
    • https://uploads.strikinglycdn.com/files/5c124d50-8d7f-4ce3-a068-354d8ae187af/xaroluna.pdf
    • https://uploads.strikinglycdn.com/files/44641a5b-709f-45eb-a231-d6628c319cc0/xiwemotedut.pdf
    • https://uploads.strikinglycdn.com/files/189909ac-1029-4a7d-9cee-cacd8944b830/primator_restaurant_prague.pdf
    • https://uploads.strikinglycdn.com/files/e52ca1b5-f665-41a0-b4a5-667487f34937/gowuvusovidaveritutojigan.pdf
    • https://cdn.shopify.com/s/files/1/0497/4336/4257/files/nutricion_deportiva_triatlon.pdf
    • https://cdn.shopify.com/s/files/1/0498/9272/0798/files/odd_fellows_flag.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/carrom_pool_mod_apk_unlimited_mod_techstribe.pdf
    • https://cdn.shopify.com/s/files/1/0501/0305/8623/files/tojifuxoxanojipewixuz.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_off00005443.bin
74ad7da9420a5612758777be28fcc2b4d491a3de7c1ad844726a13d1f276a234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5443 5320 bytes
font_01_sfnt_off0000666f.bin
6b309c4f21115800fd648c8757034055235643acf64028181c0c4fe319878ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666F 11264 bytes

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