Malicious PDF — malware analysis report

Static analysis result for SHA-256 c944a6719ff04824…

MALICIOUS

PDF

46.5 KB Created: 2020-11-06 18:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dbe66e829e9fd89d1b350d69c7ba9af8 SHA-1: 1803017a40d5e4e4be574705a8fbf034052d2ab9 SHA-256: c944a6719ff048244bd03c9b8f953dcf5396b18e5434e7379f5d6f48350d078c
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ggtraff.ru'. The document body and embedded link annotations also reveal numerous external PDF links, suggesting a link farm or redirection attempt. The presence of a 'download button' lure further supports the malicious intent of directing users to potentially harmful content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/123?keyword=hotspot+shield+apkray In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f926e004450f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f8c59b764aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5f8bcdae57495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f8db74260c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f97af86a32c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476142/normal_5fa556f83ec92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f89bf60063f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/amoretti_sonnet_79.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/columbia_county_pa_landfill.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/53872900420.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/puerto_penasco_maps_google.pdfIn PDF document text
    • https://zosejejitem.files.wordpress.com/2020/11/99243458657.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/jizirojo.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/ace_hardware_return_policy_on_grills.pdfIn PDF document text
    • https://felibule.files.wordpress.com/2020/11/51950985368.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_off0000631e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631E 5660 bytes
SHA-256: e2aedc29bae4b06f826f0cf40b30d3ef02518df5bef743b27f7cfa745049c80b
font_01_sfnt_off0000767b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x767B 5172 bytes
SHA-256: 5ec7b3d8be565c313f43a490a09fab77fee183fb8b42e9d943d45c5d45b6d493
font_02_sfnt_off00008810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8810 10708 bytes
SHA-256: e4db8d91e111e097ae777e061f5ea05659166b47def2c16bf06e70cf9abaff87

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