Malicious PDF — malware analysis report

Static analysis result for SHA-256 e056a80489601be8…

MALICIOUS

PDF

43.8 KB Created: 2020-10-10 20:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 91da6720fbe1ea9427a5bfbfe0af9942 SHA-1: f5ee131128cad68771152dadceab4edffb2a1066 SHA-256: e056a80489601be8de8262086814ec6c895f3720bd61536dc1ff75625e0d1447
184 Risk Score

Malware Insights

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

The PDF document contains embedded links that lead to a redirector service, which in turn points to a link farm of other PDF files hosted on disposable domains. The document body text, though partially corrupted, suggests a lure for downloading a manual, which is a common tactic for distributing malware. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the use of known malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.club/pify?keyword=pals+provider+manual+2010+free+download+for+windows+10 In PDF document text
    • https://site-1036876.mozfiles.com/files/1036876/21318603959.pdfIn PDF document text
    • https://site-1043759.mozfiles.com/files/1043759/zubeviduvi.pdfIn PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/29594371869.pdfIn PDF document text
    • https://site-1044301.mozfiles.com/files/1044301/24364744414.pdfIn PDF document text
    • http://files.thehaslemerecollection.org/uploads/1/3/1/3/131383721/limeje_sarorakafifomis.pdfIn PDF document text
    • http://redakeg.confederateplanet.com/uploads/1/3/0/7/130739616/zakusosizunex_tekajudu_roxigibese_pijexitojamuwut.pdfIn PDF document text
    • http://wawozibin.pupakhaghighi.net/uploads/1/3/2/8/132814989/zopojejal.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/3f0236fd-d856-4550-83a4-f1ce91072134/nikewesukufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4a3aa6-1f1c-4c9e-b000-9ba74249b2f1/13786580950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e57f5be1-318e-4ee6-902b-08c3830c8573/kisamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ec3dc7-f918-45b2-b481-edd614aeaf97/rejugawatavopur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e431b9ae-4275-40b7-b706-4068878d28ed/29983586971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9123ca64-0c6b-4ca7-842a-12ee5dcc8cb8/39264401661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4cc629-63cc-4309-84c8-028bcc60b76e/45075238875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa60c25b-4cd3-4bde-ab1a-e091ea0c01cc/22760657530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de379980-d5f7-4134-a014-80a644d68125/polabalawugelik.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_off00006b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B01 5664 bytes
SHA-256: 720712bc31f46cd4a3fa77cf23b130d528f9f42f6d078473febda0e7cedcd39f
font_01_sfnt_off00007e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4E 10332 bytes
SHA-256: d1b7b1a9ac57bcfb4597f9de1ac0f3cd4ae47cae97a62dad38acb2edfc5bbd63

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