Malicious PDF — malware analysis report

Static analysis result for SHA-256 654dfcb0850e068e…

MALICIOUS

PDF

48.3 KB Created: 2020-11-01 11:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa53e217f525faf5762b5dc15709b85d SHA-1: 13f84443a23237b65f6914c89efd1edcd7b57aa3 SHA-256: 654dfcb0850e068e0d4250a214847da48432eb04710a4131ea65b071d4945cf0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with critical heuristics indicating it's a malicious redirector and part of a link farm. The primary malicious URL identified is https://ggtraff.ru/aws?keyword=beginning+ruby+pdf, which is likely used to redirect users to further malicious content or downloads. The ML classifier strongly supports the malicious nature of this PDF.

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://ggtraff.ru/aws?keyword=beginning+ruby+pdf
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f97e5dc49b10.pdf
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5f9d27b921662.pdf
    • https://titamifafipife.weebly.com/uploads/1/3/4/3/134315234/2799501.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f948643da8ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0508/2529/8085/files/lightly_row_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/4373/4182/files/zinorimekizamofi.pdf
    • https://cdn.shopify.com/s/files/1/0494/2230/3399/files/double_occupancy_room_rate.pdf
    • https://cdn.shopify.com/s/files/1/0496/6190/3001/files/73187395885.pdf
    • https://cdn.shopify.com/s/files/1/0496/6209/9607/files/transpose_music_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0501/6476/0751/files/shimla_tour_guide_shimla_himachal_pradesh.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/nimagiwemerovix.pdf
    • https://cdn.shopify.com/s/files/1/0496/2333/5076/files/36478296385.pdf
    • https://cdn.shopify.com/s/files/1/0497/7488/7090/files/download_game_offline_apk_obb.pdf
    • https://s3.amazonaws.com/wilugugo/roxifumulufixivuriridab.pdf
    • https://cdn.shopify.com/s/files/1/0477/5575/5676/files/mesos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b6.bin
a4d2e1f4d26d660f9e6d636e55c3d5c366dda1f69bb7db66a642c30cc38c626b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B6 4772 bytes
font_01_sfnt_off000081f6.bin
97b6e1086bf120e842cfe16799542d8b539ce8d5c828ea1e6e9f27ed2bae3686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F6 10756 bytes
font_02_sfnt_off0000a683.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA683 4324 bytes

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