Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bd44babf2e724d…

MALICIOUS

PDF

69.1 KB Created: 2020-11-03 03:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cd8e055ed0bcea63128509daff2420c SHA-1: 11193df101713d0396cec7f803c43055d88fd400 SHA-256: c4bd44babf2e724d254dac16069d9e401f1fbee2c6158d2ede5787e617befc31
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is also present in the document body. The presence of a 'download button' heuristic and a large number of embedded links, many pointing to S3 buckets, suggests a link farm or redirection scheme designed to trick users into downloading malicious content. The ML classifier also strongly indicated maliciousness.

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://ttraff.com/123?keyword=hack+dream+league+soccer+2018+ac+market
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/rawobusejo.pdf
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/6389683.pdf
    • https://cdn-cms.f-static.net/uploads/4407064/normal_5f9e32061d309.pdf
    • https://cdn-cms.f-static.net/uploads/4450156/normal_5f9fc0b6666ec.pdf
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/9747341.pdf
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/5dd211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jozetej/author_s_purpose_worksheets_middle_school.pdf
    • https://s3.amazonaws.com/jotizifime/tirede.pdf
    • https://s3.amazonaws.com/kufazete/lego_jurassic_world_mod_apk_unlocked.pdf
    • https://uploads.strikinglycdn.com/files/0ae6b433-3673-4b14-92a0-d88a9e5595e5/mutebi.pdf
    • https://s3.amazonaws.com/tobobowu/usb_loader_gx_download.pdf
    • https://uploads.strikinglycdn.com/files/85b2696c-52a3-4b03-a259-560a4940bab2/29527911033.pdf
    • https://uploads.strikinglycdn.com/files/fa70bc9e-3b39-4c4c-9fe6-cfc988867b20/smartwatch_de_smartek_sw-832_color_p.pdf
    • https://uploads.strikinglycdn.com/files/e3d0c139-88b0-48a6-929d-41ee288c8ed5/diligijemikiporu.pdf
    • https://s3.amazonaws.com/falufusu/wen_sweet_almond_mint_hair_treatment.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbef.bin
e2be8bc27feac41505b3a45afdabd06fc5ed787875ffd00688f6f401c5dc2bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEF 5804 bytes
font_01_sfnt_off0000df9b.bin
b44b3f9ab9b37c5decf51f55cf63f65a487a88ef774f7a2a9b19474be929bde1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 11836 bytes

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