Malicious PDF — malware analysis report

Static analysis result for SHA-256 152efa8b407f93a9…

MALICIOUS

PDF

40.0 KB Created: 2020-10-29 00:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5f4ce69866dc53c214ee6052ff25582a SHA-1: 1d4f7ef4b6f6e4007f20facc6bcbc99c79988cf8 SHA-256: 152efa8b407f93a9197e42196d8e06a988a71ddfb2ea6e39df0fc2717889cea9
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are likely intended to appear as benign document downloads. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a malicious site.

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/123?keyword=who+is+your+great+aunt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5f928cfdc70a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_5f96f4dcd00eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_5f98bde001566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5f897a711d31b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5f9649f5b1097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f916148b1925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_5f95019c972ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5f95c762d71d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4251/2797/files/how_to_lock_formulas_in_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb044a89-1ebf-4568-a89d-f7c0625bd640/3207283510.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/tetris_worlds_pc_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c556f271-c309-4a24-bb80-a65c8adfd972/betegexugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac4b058b-2c12-4088-bec4-be9a2b7948a8/47453159216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11448d87-1821-47f7-94ed-5b2a06ccf30a/zodalaluzas.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/60468023566.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/unimac_commercial_washer_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fc151b-5898-4e56-8165-2af807b0ae7c/vuzafurufedurisevobubutiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f57311-efd0-4ef1-b0e8-e9c69449421b/grinding_machine_project_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/73174253965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3724608-fae2-45d4-a1b3-44fb0a77952a/bdhhi_powerbolt_1000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bcf5fb-4aa5-45f3-a1d9-fd7c5296f90c/38197407159.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/visionmax_hd-3k_lcd_projector.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/sujamod.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_off00005bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB0 5032 bytes
SHA-256: c106545bb9621f9cf325dd9ec4f2a100f150c4f42d3bf62df847ecf2d5e10eb3
font_01_sfnt_off00006cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 11992 bytes
SHA-256: 49d8bf0063e6102387a619c9e33d2e0ad6937726c47f393a7a2a156bb86f7f8b

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