Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbc96a113d72acb…

MALICIOUS

PDF

97.5 KB Created: 2020-11-07 14:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dea55e1d44283242639efe9fc46609c SHA-1: 801bef58dda79518dbfbc11ee8c814a54c855bec SHA-256: 6bbc96a113d72acb8599c1f30144d7f9c60d59207f58a5562aa8ea2428a848ed
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ggtraff.ru/123?keyword=what+words+start+with+gr`. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect users to malicious content. No scripts were extracted from this sample.

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/123?keyword=what+words+start+with+gr
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mijedusovineti/1813826019.pdf
    • https://uploads.strikinglycdn.com/files/5a77a10b-4b9e-4bb1-b82e-b8240b000f11/lutobawememetafikeg.pdf
    • https://uploads.strikinglycdn.com/files/007c75a9-d2ab-45be-81f4-b0ce011e49d9/90364275337.pdf
    • https://uploads.strikinglycdn.com/files/fb7ea568-fcfb-456f-b62c-da7c74051fdc/pukuvesepavuposojufod.pdf
    • https://s3.amazonaws.com/zamuriza/list_of_oceans_of_the_world.pdf
    • https://uploads.strikinglycdn.com/files/d6a5db79-bcf2-4adc-a662-cd9f68b30aaf/zumivafunas.pdf
    • https://womunulela.files.wordpress.com/2020/11/61268783659.pdf
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdf
    • https://s3.amazonaws.com/jixerubowi/howl_s_moving_castle_free_online.pdf
    • https://uploads.strikinglycdn.com/files/33f29528-5982-435c-b3bf-728528dda28c/37627439936.pdf
    • https://uploads.strikinglycdn.com/files/7743800a-b361-4ac5-aa5f-79b83c5b1ba8/braum_guide_mobafire.pdf
    • https://uploads.strikinglycdn.com/files/5565e6da-010f-4965-8765-02ce0438aeb4/bogglesworldesl_digestive_system_crossword_answers.pdf
    • https://nevosaxovib.files.wordpress.com/2020/11/vuvemi.pdf
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdf
    • https://vofefinibi.files.wordpress.com/2020/11/kumilisiwomipupupa.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
stream_003_off00007b15.bin
e7a7ca1c54efb8a542b527523730dcc8e16e8c2a7b8a9a4ecb401c4e7644fd07		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7B15 67360 bytes
font_01_sfnt_off00014255.bin
732529b98e56ee5a60a72cb3ca3726b0f7f067790de8b639ff03ddc9eb2ffcb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14255 5160 bytes
font_02_sfnt_off000153f0.bin
dd4577c04bc218afb240e1cecb92dd6a13c8896fe289a5853426a165cd33ed87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153F0 11612 bytes

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