Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d9c8ec3fff5c2e…

MALICIOUS

PDF

43.3 KB Created: 2020-07-09 13:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11578abc95f90f9fc960900a5be2a985 SHA-1: 5593670657c0fb8cbfc4cedcab856b3f3252103a SHA-256: 54d9c8ec3fff5c2e9abb303979099e6a1c817b9d678a7334ab96139484554742
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body contains numerous URLs, suggesting a link farm designed to distribute malicious content or conduct phishing attacks. No scripts were extracted from this sample.

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://ttraff.ru/wb?keyword=aggregate%20test%20procedure%20pdf
    • http://files.isabellegiroux.net/uploads/1/3/2/6/132681566/wopote-kusenawir-zogasofomira.pdf
    • http://files.victoriabetta.com/uploads/1/3/2/7/132711965/fijibatabukiv.pdf
    • http://files.meridianbodycare.com/uploads/1/3/1/8/131857193/6976761.pdf
    • http://files.canalsigling.com/uploads/1/3/1/3/131383018/8717392.pdf
    • http://files.coxevolab.org/uploads/1/3/1/3/131380733/b435077a189.pdf
    • http://files.miamir1.net/uploads/1/3/0/9/130969718/6775800.pdf
    • http://files.body-knowledge.com/uploads/1/3/2/6/132681824/2094315.pdf
    • http://files.incheonmun.com/uploads/1/3/1/4/131411197/zifonab.pdf
    • http://files.yueguangbaohejewellery.com/uploads/1/3/0/8/130874307/webinibad-jakasugudene.pdf
    • http://files.mollybooth.com/uploads/1/3/0/9/130969294/99a95d517.pdf
    • http://files.tcnighttoshine.com/uploads/1/3/1/6/131606280/jumovixer_taxoxel_wikepevim.pdf
    • https://vokizowonaso.files.wordpress.com/2020/06/jajonopinaxos.pdf
    • https://tuforomo.files.wordpress.com/2020/06/74346285356.pdf
    • https://zudarimun.files.wordpress.com/2020/06/28613562001.pdf
    • https://bugigos.files.wordpress.com/2020/06/sobebusazomivosobedul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bisadugizutojaririxenudep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tazoxusejeko.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cd5.bin
07e1a6aa5c43c31f84d86a9813a0b2352d2745608d2bfd3a74da5b8185e0d289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD5 5008 bytes
font_01_sfnt_off00007def.bin
dfaecaebed76992c0476acf9c85d41f9f13b9f81113472ad16e8f4346b15e99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEF 10072 bytes

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