Malicious PDF — malware analysis report

Static analysis result for SHA-256 686d6c113a760392…

MALICIOUS

PDF

43.3 KB Created: 2020-10-31 02:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c7edc0038a734a0becfd9ab63d2c39ca SHA-1: a40da23ad378f6cdfca0bf4b09b4e9e5d587c53c SHA-256: 686d6c113a760392ba43ac2c801ced13c6d30c52051cb5cf2f7b2e0704a96b7e
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a PDF download and a URL that appears to be part of a link farm. The presence of numerous external PDF links suggests an attempt to manipulate search engine rankings or distribute content through a network of linked documents.

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/aws?keyword=what+color+is+your+parachute+2018+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5f8b4b58bc750.pdfIn PDF document text
    • https://zefubolinela.weebly.com/uploads/1/3/4/3/134318842/6001754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f891dec08f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5f95897380777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_5f9bacb93448e.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/pezofut/hershey_smore_maker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9720/1576/files/zejajaromiwakazid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6525/2253/files/46529167601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8446/2274/files/particle_diagrams_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6992f35-6429-494a-9eee-0f640e882a22/which_of_the_following_is_not_one_of_the_disadvantages_of_peer-to-peer_networks3F.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf731f57-011f-46a4-8ad8-96abe86f7854/20252008270.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_off00007ff2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7FF2 19628 bytes
SHA-256: 764e7308ef0e9678fdda435900c56249944cfc8889546e2d9111465fb5718f95
font_00_sfnt_off00004458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4458 5968 bytes
SHA-256: 1b1f49d653d399b4b096a23f97716ccb4a4e2d67340e4aa26667459d35d34c5b
font_01_sfnt_off000058cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58CD 12468 bytes
SHA-256: 481fa005c60216c5332502c350682ce7d40126c2ee236df9d3c7fc610fd58a22

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