Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a34c853f6e8ede0…

MALICIOUS

PDF

60.9 KB Created: 2020-10-25 19:03:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1e0f17b0799a68930d3bea301198f9bd SHA-1: 7166e0ab2f7a65f25e5dc02c912e70f061c8ca6b SHA-256: 8a34c853f6e8ede038c88e70606e1cedef74fbe2fd8e8d74059ee958792e15d1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'food truck business' and the malicious URL. The presence of many external links suggests a link farm or SEO poisoning tactic to distribute 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/strik?keyword=idiot%2527s+guide+to+starting+a+food+truck+business In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f876e71f03d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f8f4ea69272c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5f8e49bfb9568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f8760368f8fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f8babbb3d37e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7a739e-bb05-4e65-ac6c-80589b44104c/60159952204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9e16d7-e9ab-4f14-9c81-9cae94522e10/80444454681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576a118f-faf2-46ee-80b3-06584ab0af45/67915399182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79a686c-b9e8-4f89-8ca9-27fdb30e9cb1/klein_multimeter_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f9e0360-5cb2-44ae-9280-5d8ec192b657/vunonefuboxapigugozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77942d7-2cbe-43f9-b1bf-26c9b452c501/xifaramesosekituwosipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d5677b-2274-4abb-b889-8563243d4957/tetiwuginu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0205/0978/files/76937337435.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8683/0496/files/66476818569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6384/1446/files/free_halloween_worksheets_for_4th_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/2190/0186/files/folewafagenapilaroxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/command_prompt_commands_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/toyota_avanza_2011_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/asme_code_9.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC5 5332 bytes
SHA-256: 63b7fe4f02937c14f928cadce9ca3b3b583d6449c46cae56674f1e7a5d2df1d8
font_01_sfnt_off0000c002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC002 11088 bytes
SHA-256: 1cdfb9a6ce369db3d8f1abc8069f83f5dbd774d6503d06bcdec1e72b89630fe0

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