Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcb7a195e217088…

MALICIOUS

PDF

47.7 KB Created: 2020-10-27 16:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 930033804334e8634853af1e4faaceaa SHA-1: 19d2c79f451f5fba05bd00047c9e4c75ae30b22a SHA-256: dfcb7a195e217088ac9575b08da63900400f38ddadd33a1b7a3c6f37762d1b4f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on various platforms. One of these links, https://ttraff.ru/123?keyword=tempering+darkness+wow, is identified as a known malicious redirector. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious content or 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.ru/123?keyword=tempering+darkness+wow In PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/fezepi.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/fulekoxa-susupol.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/bizulexeru-balasibolujamu-loketivajotalo.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/96b45a7f16.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/ddf57535cf.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/100317.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/6577302.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0a672e3d-e88e-43dc-9913-5ca57ad40d11/11305092290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1c72ae-e318-4dc4-8140-9f247683602e/kolanenuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ed52eb-9ffd-4484-bdb7-f0c6783f3977/jabakoxuwagiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95c8c59-bd0a-46f7-9c58-d7c435be1592/23592918225.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/fundamental_breach_of_contract.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/sozugebanazepobugepefilon.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/changeling_the_lost_winter_masques.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/statistics_and_data_analysis_in_geology_davis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5adf47a-45b6-460a-aecd-19f2af0f63a3/84015456699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7c5955-afbc-4173-8377-92ece9729b7c/1335922359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfaa8064-1159-4093-89b3-ed52ad01a359/hile_program_indir_telefona.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000681f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x681F 5060 bytes
SHA-256: b840ce9c6dd3c32d1f06ca8d2848dee8999335a2fb9901f88b65e19eba476b4e
font_01_sfnt_off0000793e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x793E 12232 bytes
SHA-256: 259f9f6462159c790e0b079ace24c2b9f7f3ecbbb2822a2d0570e128c587ff98
font_02_sfnt_off0000a34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA34C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176