Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd6fe41188ff7ae…

MALICIOUS

PDF

37.2 KB Created: 2020-11-07 02:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fd94c3981fef465d79179cdf7547f433 SHA-1: b0cedfa7694a7fe38fd725ba48d4e2252634b6f7 SHA-256: 6fd6fe41188ff7aef70384924cc30b8f999f37b80db6422f8cc0107abc04b0ed
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or SEO spam campaign. One primary URL, https://trafftec.ru/aws?keyword=cite+merck+manual+online+apa, is embedded and likely serves as the initial lure. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links aligns with techniques used to distribute malware or drive traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=cite+merck+manual+online+apa PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xeruluzolu.files.wordpress.com/2020/11/25837274361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/562babca-401f-417a-8411-008e891da406/64517243471.pdfIn PDF document text
    • https://direfaxa.files.wordpress.com/2020/11/44616410186.pdfIn PDF document text
    • https://mereposen.files.wordpress.com/2020/11/13253055864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873cba96-2cf4-4c14-9598-4b31cd6d7464/78757541020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b71a0c0-b26a-4dbb-bad4-05737826d945/the_springs_hotel_lexington_ky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1df0d5b-c8ac-432e-9f9c-982f89da6658/tobawiwitibitowas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c044b434-9b7e-4b63-ae69-256d17ef1647/74671358765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f826243-b4f2-4c12-ab92-894b936034da/ludigoketivage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f5b6d4-95f2-4e84-8f96-8abe8848f3c4/10488845852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7118bc-6d14-4539-abef-5babd7195971/kusekosisixoxagolozozi.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://gabigofu217261868.files.wordpress.com/2020/11/5590065990.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_off0000524e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x524E 4872 bytes
SHA-256: dceb5e826fb5040c60ae152118b9c2ea18d30311a9c3ea4c3b802b7edcdb4dd0
font_01_sfnt_off000062c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C5 11188 bytes
SHA-256: f81c4dbeab48fc80c5e955cb4c87f515fd190b5709c7edf1231299064e42f3da

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