Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91dfd510d45f7fb…

MALICIOUS

PDF

43.5 KB Created: 2020-10-15 08:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d94f1cc6f500acdc3afc694bd353253 SHA-1: 694bcb00bc1a8dafc4ade4414d0e63551989df0d SHA-256: f91dfd510d45f7fb682f997a12da14ed356e7022e5e4dda68e53af033290ba8f
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a keyword related to a popular game mod. The heuristic 'PDF_SEO_LINK_FARM' indicates the PDF is part of a larger network of documents designed to artificially boost search engine rankings, likely to distribute malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly suggest an attempt to lead the user to a malicious site, potentially for further exploitation or phishing.

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/123?keyword=bendy+and+the+ink+machine+mod+apk
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/21e75.pdf
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/detusesusixer.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/rezewupiladu-ridumubumip-nutomixutuj.pdf
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f876210b50da.pdf
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f87698ed6579.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/86369bda-4c54-4555-8edc-e0a051dc1f1d/72574499091.pdf
    • https://uploads.strikinglycdn.com/files/22e0f4d6-b527-4093-a788-fb65333494d5/16102725300.pdf
    • https://uploads.strikinglycdn.com/files/f0e5c913-b136-40e7-b2ff-5bf9396d93ae/tuzubaviseredute.pdf
    • https://uploads.strikinglycdn.com/files/260bd1fe-86ba-4097-aa97-af4ca0fd8f33/44678487580.pdf
    • https://uploads.strikinglycdn.com/files/21ba1167-0593-44d5-aa60-d9f67d7b4363/novukijimovuxowolabi.pdf
    • https://uploads.strikinglycdn.com/files/532f0a63-251f-48a1-a066-92fe833930dc/24230571850.pdf
    • https://cdn.shopify.com/s/files/1/0487/1284/3414/files/56047896316.pdf
    • https://cdn.shopify.com/s/files/1/0497/2996/2141/files/dozugofota.pdf
    • https://cdn.shopify.com/s/files/1/0486/5248/4766/files/what_year_was_the_ffa_creed_revised.pdf
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/48096875636.pdf
    • https://uploads.strikinglycdn.com/files/815ec2d0-eaa0-45c5-b33b-e231d28e34c9/26134603615.pdf
    • https://uploads.strikinglycdn.com/files/e3625cb3-f6a1-4249-8b85-459b85e24a69/dilerosikazafobutu.pdf
    • https://uploads.strikinglycdn.com/files/64a229b7-0f00-4322-b76f-4c8188a11347/25912073288.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_off00006c8f.bin
569f25336239f28cb6ca74521b15bd458dac64a7285d32956409e45aa3dbcb01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8F 5224 bytes
font_01_sfnt_off00007e31.bin
6bd3f7713611a404d56c2efbb10a652f08504ca8749f7e0aeeb079f5efb12b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E31 10076 bytes

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