Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5506ea0c96ec1f…

MALICIOUS

PDF

48.1 KB Created: 2020-09-29 19:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b17bc47faef3bc4ddd4ca0f2a7f4c4c SHA-1: 6d1cb163d82cab3748e644fe907b0706d5384237 SHA-256: 8c5506ea0c96ec1f318b5619156896111d2146ef3ce44df8eb2bb7dbfde5c333
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, embedding numerous external URLs. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to a known malicious redirector, suggesting a potential phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct execution behavior.

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://gettraff.ru/strik?keyword=english+japanese+medical+dictionary+pdf
    • https://site-1037240.mozfiles.com/files/1037240/43999972194.pdf
    • https://site-1037121.mozfiles.com/files/1037121/jotasabijit.pdf
    • https://site-1036934.mozfiles.com/files/1036934/96218667178.pdf
    • http://nijazak.baptistelakecampingandstorage.com/uploads/1/3/1/3/131398589/netisalus.pdf
    • http://files.westendcroquetclub.com/uploads/1/3/1/8/131856987/zonimej_zimuzono.pdf
    • http://files.wchqfm.com/uploads/1/3/1/4/131452950/duxoso.pdf
    • http://files.welloiledmamadesigns.com/uploads/1/3/1/0/131070718/c715a3780440.pdf
    • http://texul.walkerlawofficepllc.com/uploads/1/3/1/8/131871426/jejalix_waxatigivigigeg.pdf
    • http://files.tiloscleanwater.com/uploads/1/3/2/6/132683246/7880899.pdf
    • http://files.clarevet.com/uploads/1/3/2/6/132696104/vavufibepidaraza.pdf
    • http://xiwodi.senjistudios.net/uploads/1/3/1/4/131482916/kalozinuriweg.pdf
    • https://uploads.strikinglycdn.com/files/5988bb65-7ef7-4dc8-9698-21158be0f8af/56502776361.pdf
    • https://uploads.strikinglycdn.com/files/fe394622-09cc-4c33-88cb-7f39749ec3d1/muluzozidu.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f54.bin
e1c916d7993394cdbbb00b8660d51766054bc9904ec175c66083dad166816229
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F54 5492 bytes
font_01_sfnt_off000081e0.bin
540caac226e33f1c9a768e616feffddf909bfc1acf51c7f63e24b1619d3d4fe2
pdf-font-stream PDF embedded font (sfnt) at offset 0x81E0 10444 bytes
font_02_sfnt_off0000a585.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xA585 4324 bytes