Malicious PDF — malware analysis report

Static analysis result for SHA-256 abae7d5ae5050bb8…

MALICIOUS

PDF

72.9 KB Created: 2020-12-29 11:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 379a66d7a04f00b6b0e6b1be77faf9f4 SHA-1: d29bcf5b4f59c7a8b3cadd482df33b0835633294 SHA-256: abae7d5ae5050bb8a71c9214c5780e0135b3a553ce79395a6bfa9cf2f3271908
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external links, one of which is 's3.amazonaws.com/najubu/wharton_case_book_2012.pdf'. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the document is designed to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=journeys+interactive+series+mod+apk+sbenny
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fdd218a42455.pdf
    • https://cdn-cms.f-static.net/uploads/4450417/normal_5fd7ac87c2ada.pdf
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f8e176108fab.pdf
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fc79d08deb90.pdf
    • https://gipafefigemer.weebly.com/uploads/1/3/4/0/134097902/genawixuga.pdf
    • https://cdn-cms.f-static.net/uploads/4420589/normal_5faedec85d9a0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/najubu/wharton_case_book_2012.pdf
    • https://uploads.strikinglycdn.com/files/a4f5ff77-b60c-48e5-a216-b18c4ea73d9d/jelezele.pdf
    • https://uploads.strikinglycdn.com/files/8607a448-e2ac-490f-9db2-9d8b45ce7225/pirate_festival_new_orleans.pdf
    • https://uploads.strikinglycdn.com/files/8880e486-7b83-47fd-8f2b-23d311e18327/predicate_nominative_and_predicate_adjective_quiz.pdf
    • https://uploads.strikinglycdn.com/files/397875b8-2c10-4abe-a26c-f6417ada4010/26098512243.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_off0000dd57.bin
8204413a68b33db2498653a41ba5925942001229351d50fa3efcfddc18bf0af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 5540 bytes
font_01_sfnt_off0000f025.bin
b634c81e220774fa5b766010151fba212a43c310911e81496c7c291ddcb43176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 10596 bytes

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