Malicious PDF — malware analysis report

Static analysis result for SHA-256 636c6be5cfbb1cd5…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 11:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86ba81ee48361763513662bb07ebf86d SHA-1: 7e5bc84b0164382297f33716ea7b0d9684cf669b SHA-256: 636c6be5cfbb1cd5461abef366704016c365620b9d217c39452dfd0d52dca32c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious sites, potentially for further exploitation or phishing.

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://ttraff.ru/pify?keyword=hero+system+bestiary+pdf
    • http://files.lbtdlaw.com/uploads/1/3/1/4/131453429/2861433.pdf
    • http://volesarud.saintgeorgechurchok.org/uploads/1/3/0/9/130968917/pejaxaki.pdf
    • http://files.jacobsearslibrary.org/uploads/1/3/1/4/131453588/xitofizawiz_juxefo.pdf
    • http://files.blackbearantiques.co.uk/uploads/1/3/1/0/131069863/welumumud_julege.pdf
    • http://files.platonicadventures.com/uploads/1/3/0/8/130874655/laxolo_mobiridixeb_raroperas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/mathematics_books_for_class_9.pdf
    • https://cdn.shopify.com/s/files/1/0429/3784/3871/files/varices_esofagicas_cirrosis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/begoraladosunejezutemux.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/sefepekekijunoli.pdf
    • https://cdn.shopify.com/s/files/1/0437/1110/3128/files/tecumseh_carb_adjust.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/vubuzuvi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8113/6296/files/php_clear_opcache.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/81968924208.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3535/files/wulimufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61051106257.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/m_audio_fast_track_pro_drivers.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_off0000683b.bin
ceab1e405fcd7d9f0be0e742c8bd836cf4c8a8c109227e64829c7d0f5004c3f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 5356 bytes
font_01_sfnt_off00007a5b.bin
3dc40eb2afbad388098e60d591fc496debf163687e723d2e2edc008fe81b2068
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5B 10948 bytes