Malicious PDF — malware analysis report

Static analysis result for SHA-256 798d9ec880e49c46…

MALICIOUS

PDF

63.4 KB Created: 2020-12-17 01:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68c5c10ad9dfe8ead0397239a323c7ff SHA-1: 118598770de6a29d1171f3d296f12f5b2bc8ace1 SHA-256: 798d9ec880e49c46e82a71d01735ac11ad1166af9ff22fb105f6b827fd531b9a
154 Risk Score

Malware Insights

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

The file is a PDF containing a link to a known malicious redirector URL, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier and ClamAV also flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Proform j8 treadmill belt replacement', suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://gettraff.ru/aws?utm_term=proform+j8+treadmill+belt+replacement
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5fa230fcf35ed.pdf
    • https://cdn-cms.f-static.net/uploads/4485589/normal_5fb8a5983e2e9.pdf
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5fca3c98a2d74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/debamijizozexo/tufaza.pdf
    • https://s3.amazonaws.com/xukirizugukugi/baptism_for_the_dead_catholic_answers.pdf
    • https://uploads.strikinglycdn.com/files/7732039c-7be8-4850-8715-ad9e9fa27d72/potijetumafifutijekisuxu.pdf
    • https://s3.amazonaws.com/bejideba/19374284245.pdf
    • https://s3.amazonaws.com/vatakefojunib/anki_flashcard_decks.pdf
    • https://uploads.strikinglycdn.com/files/2238a5b2-11df-4362-b26d-0d5acbb4caf6/skyrim_forgotten_city_immaculate_armor_gauntlets.pdf
    • https://static1.squarespace.com/static/5fc7b7d9c89b935f15e3f851/t/5fd1251f8c49b64c3bc572e3/1607542047617/wood_projects_that_sell.pdf
    • https://s3.amazonaws.com/remeranexe/gazogarisimigoxopakuvar.pdf
    • https://uploads.strikinglycdn.com/files/e5677a74-c856-45a3-9566-08a16ddd5050/kinepefesomovixosukemuv.pdf
    • https://uploads.strikinglycdn.com/files/c50175cc-5618-4490-a264-e905b5f44b2d/61638150891.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_off0000b473.bin
1ed1afc4c55ca4fa08b31c8f67378660365317b7af90555f22472ad285c9c261
pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 5532 bytes
font_01_sfnt_off0000c72c.bin
003fcfb996889ce2ffcf1b23f52d010aed522a70d478f184888acc93cd318546
pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 12996 bytes