Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf3bfcf52325bdc…

MALICIOUS

PDF

56.9 KB Created: 2020-11-02 02:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c05b8f44a305f83d12cadac65302fad3 SHA-1: 2fef39349065f93b8f8fd88f8f87ded6b04b963b SHA-256: bbf3bfcf52325bdca3d80f9acf92d04ff937d8f5b503d1a3a20687410db96a88
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The presence of a PDF link farm heuristic suggests an attempt to manipulate search results or distribute further malicious content. While no scripts were directly extracted, the ML classifier strongly indicates malicious intent, likely related to distributing or redirecting to malicious content.

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=google.com+search+pictures In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5f94631853ea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5f9b759806620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5f9ce83165afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f8927f262823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/cement_manufacturer_s_handbook_peray.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/67006021743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5044e8de-6e66-44a1-822c-63793d849dc1/dojufupomubofuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7214/2497/files/apresentao_da_empresa_para_clientes.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/51171738059.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/5284/0134/files/kabunemi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1013/5482/files/bebegeme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6993/1172/files/negotiable_instrument_act_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/37187357914.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/watch_the_wolf_of_wall_street_putlockers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6630/0851/files/ps4_conexion_a_internet_error.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ae4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAE4B 23156 bytes
SHA-256: d3712127b8a13e27c04a3682eea16dc8593005fa035cc465331e3de816306c62
font_00_sfnt_off000074ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74EF 5412 bytes
SHA-256: 2efa2447d09b1ebe3895778efc7cf5c268da9b819f8ca8f58c0a29695a7568c0
font_01_sfnt_off00008735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8735 11576 bytes
SHA-256: f94db5c01959722f03399237afcad2f6152e2cd541880a58d7d719b34ea50024

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