Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f23ea6fe41da355…

MALICIOUS

PDF

39.9 KB Created: 2020-10-26 19:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a76e66f3779ff3de92fd642687e0c99 SHA-1: 5c2e70305811dc673ddd570bab9a6407a2e221a3 SHA-256: 3f23ea6fe41da355aba0f28f942498b3b34504d48c519175547c8b3b81ccbc47
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users to click on it. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=gods+of+food+and+drink
    • https://giledaxije.weebly.com/uploads/1/3/4/3/134312043/8654280.pdf
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/dixafipiduw.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/210471.pdf
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/sudigefi.pdf
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdf
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/8831460.pdf
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/4362893.pdf
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/4d784fb31cc88.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/2e53fdf61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zedilegol/affairscloud_may_2018_download.pdf
    • https://s3.amazonaws.com/badodemebo/enquiry_letter_in_business_communication.pdf
    • https://s3.amazonaws.com/fefurorobumi/71035377354.pdf
    • https://cdn.shopify.com/s/files/1/0481/8881/7562/files/mewalivikezadofarawejo.pdf
    • https://uploads.strikinglycdn.com/files/5539b9fa-ef2a-4874-a593-129923bc825a/best_two_handed_weapon_pathfinder.pdf
    • https://uploads.strikinglycdn.com/files/b84307aa-16e3-4fec-9e34-3da5f6a96789/chuyen_sua_poder_en_hermano.pdf
    • https://uploads.strikinglycdn.com/files/21543282-2cb0-4887-afa2-5e6331588d35/13929707911.pdf
    • https://uploads.strikinglycdn.com/files/e3667ffa-1a8a-467f-8c2d-8c78392edf7f/gezotovotapanokejoxadil.pdf
    • https://uploads.strikinglycdn.com/files/9e437153-81d5-4ac7-8791-fb465ba9d88e/dark_souls_3_save_transfer.pdf
    • https://uploads.strikinglycdn.com/files/865ada29-6dc2-49c1-87c8-a2d6a2aab80a/39479833875.pdf
    • https://uploads.strikinglycdn.com/files/4372ed4d-581c-48d1-bd9c-92f39251fafc/82088714610.pdf
    • https://uploads.strikinglycdn.com/files/c2cc20f0-268b-4920-993e-2ec94558ed87/6961957345.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_off00005c6c.bin
e62463bcdae6c9070937ef95bdaa8296102320ba647653346df6cf14c715beac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6C 4964 bytes
font_01_sfnt_off00006d66.bin
f224e9b012d145019ecfd01e3b5a8c690d6e96f319063cff6752c34525038703		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D66 10936 bytes

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