Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4a9216a4d8073f…

MALICIOUS

PDF

46.4 KB Created: 2020-11-05 19:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a921db7952f82137bb4f843449eb4123 SHA-1: e4390dece9c175eeba6e3cdcf55a4448021cf737 SHA-256: bf4a9216a4d8073f72174035198f462ddd79ae99c2eec2463c671b9ef8ae67e9
94 Risk Score

Malware Insights

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

The PDF file contains a lure related to a rent increase notice, which is a common social engineering tactic. It embeds a URL that is flagged as a malicious redirector, indicating an attempt to lead the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/aws?keyword=free+sample+of+notice+of+rent+increase+letter In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zetare/3177301413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7829f6fb-58ed-4914-a098-c34cd2cf2687/rifawovor.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/pebudariwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82baaee-91fb-42a6-b58a-88757caf3821/bedam.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/dnd_5e_players_handbook_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43cb734-cb34-4075-82df-ed6e626d2279/clash_royale_arena_2_deck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c108b3d6-243f-482e-9056-0ab899b91229/92949533141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ae0a6d-c7ad-4cdc-81a1-094efdfdee88/37216099163.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/zilugixibewesesamuku.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/23612460007.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/colostomy_bag_care.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/spartan_weaponry_mod_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/properties_of_matter_worksheet_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/4816729495.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_off00007497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 5116 bytes
SHA-256: 62d8b2e95606e6670a891bcaa731da320f125ff7492d600777604fe351b6bfca
font_01_sfnt_off000085ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85ED 11884 bytes
SHA-256: b4370309597d9f0348d65f4eb6a7756491bd6ef0f38591f8f9120ad35e9bd477