Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8e8218f7aa6b4c…

MALICIOUS

PDF

47.8 KB Created: 2020-08-11 09:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00b2a65d264aaf63f0a8bccf4f4e24d1 SHA-1: 75432f2a01d500d650f42d797f6e9a942cf8c302 SHA-256: 4d8e8218f7aa6b4c197383ebb6316e3c37644cd12d6884bf06b00471c92b0b50
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains the suspicious URL 'https://ttraff.ru/pify?keyword=presentarsi+in+spagnolo+pdf' and references 'wkhtmltopdf', suggesting it was generated programmatically to host a large number of links. The primary attack pattern involves luring users to malicious infrastructure via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=presentarsi+in+spagnolo+pdf
    • http://files.bsakoaks.com/uploads/1/3/1/3/131398094/5434590.pdf
    • http://razisitoj.padrepiogroup.org/uploads/1/3/2/8/132814930/xowanijuret_gituxulafarato_kodivegedav_gugobidufuki.pdf
    • http://files.riveroflifechurchcu.org/uploads/1/3/1/4/131453494/c20150c5a5b2086.pdf
    • http://silatepuv.evolvevolleyball.com/uploads/1/3/1/1/131164250/jizijevawubenasakiti.pdf
    • http://files.lambersfisher.com/uploads/1/3/1/6/131606087/fikojuno-tanaz-zofaliwiwiguw.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/mapolopapoketezime.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52135332303.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5250/files/90480176185.pdf
    • https://cdn.shopify.com/s/files/1/0434/5046/6471/files/93610762222.pdf
    • https://cdn.shopify.com/s/files/1/0429/1444/7519/files/acceptance_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/google_doc_checkbox.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/51429487201.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/48865059897.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/7689/4372/files/bayesian_inference_in_statistical_analysis_box.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/sirujibugokosogatorutono.pdf
    • https://cdn.shopify.com/s/files/1/0428/6427/9718/files/64332048966.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c32.bin
941218df973b767e04206fcd4b5aded921838cbd03fccc0fe396ea6a24ab414c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C32 5212 bytes
font_01_sfnt_off00008dee.bin
ee82b5bd0ccbce271c97a01d14682bae9e813c7b42526638e5530621c786caa9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEE 11208 bytes