Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8723e354bee7fa3…

MALICIOUS

PDF

58.4 KB Created: 2020-10-31 06:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73ddee012579c0b04f4f681bc2764b23 SHA-1: e74bd5a2db37afc834b4e7bc8517226e39fe3833 SHA-256: b8723e354bee7fa334efe6a3078c309249f107d4e286b88006eb2f7ddcb01349
154 Risk Score

Malware Insights

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

This PDF file exhibits malicious characteristics, primarily through its extensive use of external PDF links, suggesting an SEO link farm strategy. It also contains a direct link to a known malicious redirector, indicating a potential phishing or malware distribution attempt. While no scripts were extracted, the presence of these malicious links and the ML classifier's high confidence score point towards a malicious intent.

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://gettraff.ru/aws?keyword=ark+t+rex+trap
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f87db8397f9f.pdf
    • https://cdn-cms.f-static.net/uploads/4405950/normal_5f9ca432ed8a8.pdf
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/95641cf1b1e.pdf
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/jemov.pdf
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/tedugolakonaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0504/6294/9551/files/toy_story_buttercup_quotes.pdf
    • https://uploads.strikinglycdn.com/files/9fb68d43-5b8e-42d8-b6f8-e32e4100f94b/82798415439.pdf
    • https://uploads.strikinglycdn.com/files/6b9eabee-aa11-4fde-9df2-3dc2b3c9f4d2/47439986735.pdf
    • https://cdn.shopify.com/s/files/1/0479/3132/6631/files/94817292933.pdf
    • https://uploads.strikinglycdn.com/files/a0f4090e-7fb0-45c0-b2c6-78917279c876/zexabitajowuxerarunivi.pdf
    • https://cdn.shopify.com/s/files/1/0484/2356/7512/files/tinafupopabobukop.pdf
    • https://uploads.strikinglycdn.com/files/0da90ab8-aadc-410d-975f-e8cf7b04fe62/vovavoluzesa.pdf
    • https://uploads.strikinglycdn.com/files/f1c0d385-632d-40c2-8da1-3f7a4b31f9a8/risazewufuvaxosu.pdf
    • https://uploads.strikinglycdn.com/files/9a2fe2d9-1496-483b-850d-5cb26ca58c83/bebabozawapo.pdf
    • https://cdn.shopify.com/s/files/1/0493/7108/7007/files/overdrive_2_mod_apk_android_1.pdf
    • https://uploads.strikinglycdn.com/files/bdd7d65f-8cc6-43ed-a940-89c15859b8f0/father_john_s_animal_shelter.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_off0000a680.bin
6ef1658c7196d834b123b835323f29e959167a399ba5aca56fb0c44921dd78a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA680 4724 bytes
font_01_sfnt_off0000b6a5.bin
3a8b28bd5bda5485bb59b694c9545567e0e019417bcf000a726465a55d4c8c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A5 11132 bytes

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