Malicious PDF — malware analysis report

Static analysis result for SHA-256 890e8ddffb6d9bef…

MALICIOUS

PDF

41.0 KB Created: 2020-11-02 06:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be14a5252bdfb65a76c33c8613d714c0 SHA-1: 788ab85973249b2c3ceb75295d4b1118a56c4099 SHA-256: 890e8ddffb6d9bef56b78a9bd0ed8ae4a999c65c4a708b317cac868d0cbc3339
154 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its extensive use of embedded links, with a critical heuristic firing for a redirector link to `https://ggtraff.ru/strik?keyword=desert+food+web+food+chain+energy+pyramid`. The document also contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

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://ggtraff.ru/strik?keyword=desert+food+web+food+chain+energy+pyramid
    • https://xexegetogud.weebly.com/uploads/1/3/4/3/134375989/miwebet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0505/8304/4253/files/44945203947.pdf
    • https://uploads.strikinglycdn.com/files/3db113cf-e0bb-4d86-a67d-9a1d6ff4ef31/naxetawinumebudazodisipuw.pdf
    • https://uploads.strikinglycdn.com/files/9b17b192-1f44-43c0-800f-3ceb3e91b87d/49852545031.pdf
    • https://uploads.strikinglycdn.com/files/b5e3da8f-0212-4d9e-92f0-65406e33e5a3/anonytun_achi_apk_mod.pdf
    • https://s3.amazonaws.com/dobesogum/nys_common_core_standards_social_studies_9-12.pdf
    • https://s3.amazonaws.com/damevusom/roland_park_elementary_middle.pdf
    • https://uploads.strikinglycdn.com/files/e4a023a4-1bb8-4089-a038-c3e7ad18a0b6/mat_danh_iris_1_thuyet_minh.pdf
    • https://uploads.strikinglycdn.com/files/a1cb3c10-cf70-474a-8dec-f75c0888fbf2/89893189473.pdf
    • https://s3.amazonaws.com/remeranexe/74974272564.pdf
    • https://cdn.shopify.com/s/files/1/0438/7943/2347/files/manil.pdf
    • https://s3.amazonaws.com/rizezobabub/lonifosew.pdf
    • https://uploads.strikinglycdn.com/files/c3902338-a3d8-486f-881c-dd0a12c29cec/zobafevebamemuti.pdf
    • https://uploads.strikinglycdn.com/files/4611d956-8b00-4f72-93c6-ae9ab51eb3c4/freebox_hd_v5.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_off00005e58.bin
9f85a5aff3c24fe533afa5e82f61cb85936abf584e8d043863b6139a47e928d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E58 5868 bytes
font_01_sfnt_off0000724a.bin
f84cac89986e6eed07770fc967d190feef642a522d6c9658a045efe094b25bd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724A 10896 bytes

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