Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd535731e993046f…

MALICIOUS

PDF

69.7 KB Created: 2020-12-27 10:35:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d33ab8237988873c06d1ae4aa71e1c6a SHA-1: d5b0e8f51c085749f230cb397250fc4f4160ed44 SHA-256: bd535731e993046f3ba6bba09fd88bb22f523dffaa806c91e9c3794f0e3b34dd
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with critical heuristics identifying it as a redirector and part of a link farm. One critical heuristic specifically flags a link to 'ggtraff.ru' as known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=west+bend+coffee+maker+33600+manual In PDF document text
    • https://cdn.sqhk.co/dodiniwotud/ifaQidy/spin_the_bottle_game_download.pdfIn PDF document text
    • https://kalokiran.weebly.com/uploads/1/3/4/6/134632324/8522530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5fe57b3d25de5.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/aieihmw/77064634961.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vibove/dynamic_korean_workbook_1_chapter_9_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/58500379398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89121f22-64b6-4701-a90f-5dc339433a82/fly_exeter_to_belfast_city_airport.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/add_text_to_adobe_acrobat.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/king_single_bed_sheet_sale.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 5844 bytes
SHA-256: b27974cc28e037486d7ec23ec5fc8526dd1db397dce234b28892ed192a6c2323
font_01_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 10120 bytes
SHA-256: 8cc0205c3aefb5a8fc01358c55597eb87cedf08bd18e4cdb76f7e504d6b668a4

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