Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f93f2571d1f104…

MALICIOUS

PDF

44.7 KB Created: 2020-10-29 08:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e14e08ebb03bb2364f4fa1f77732f4cb SHA-1: bd9e109915972f71f0a4fcd2bca13a3cd878bbf4 SHA-256: 91f93f2571d1f104f53c24c7a1b78aa452ec3895b54b51a83e2bc2bded992db2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content, likely as part of a phishing or scam campaign. No scripts were extracted, but the presence of embedded URLs suggests an attempt to lead the user to malicious infrastructure.

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://ggtraff.ru/pify?keyword=blue+book+of+grammar+capitalization
    • https://kidunaxu.weebly.com/uploads/1/3/1/4/131437100/loguj_weditawuruxarip_sosofikobumo.pdf
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f879b9fd0e73.pdf
    • https://cdn-cms.f-static.net/uploads/4408188/normal_5f950d4b3ec57.pdf
    • https://cdn-cms.f-static.net/uploads/4374177/normal_5f8f966cce267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/27567276-005e-4e41-9725-31489020fc0a/fiwevozigiz.pdf
    • https://uploads.strikinglycdn.com/files/ce9831df-6af9-4ab4-9063-73226dbf8d65/pisod.pdf
    • https://cdn.shopify.com/s/files/1/0498/3871/9131/files/anime_short_hair_male.pdf
    • https://s3.amazonaws.com/zazelujeju/death_march_season_2_kapan_rilis.pdf
    • https://cdn.shopify.com/s/files/1/0497/7934/3527/files/joregefabanesunokiliseg.pdf
    • https://uploads.strikinglycdn.com/files/055a09a2-5eca-4263-b371-dc50bc156681/the_value_of_philosophy_bertrand_russell_essay.pdf
    • https://uploads.strikinglycdn.com/files/cbd2adcf-4846-44b7-873a-12ba56fcc27e/25441095383.pdf
    • https://s3.amazonaws.com/tunenijexe/seat_ateca_2018.pdf
    • https://cdn.shopify.com/s/files/1/0479/6347/2028/files/accessor_method_and_mutator_method.pdf
    • https://uploads.strikinglycdn.com/files/1c71f28e-d17c-4990-a408-784bc17405b6/27546440085.pdf
    • https://uploads.strikinglycdn.com/files/ce5a2c6f-03c4-4933-a5f8-ab5bcc7e460a/pipetidowanivosobuju.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_off000070df.bin
1ff7ba3a5438c38fe486966d8ece83f3e0a09cc127dfdf2fefce029437401387		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DF 5460 bytes
font_01_sfnt_off00008374.bin
ff1b77ef86d43b9fb2c15995767ac0d6440dcffae8a23e8f12e1eddc9f9eae42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8374 10140 bytes

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