Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22c33cc80f0181f…

MALICIOUS

PDF

41.1 KB Created: 2020-08-19 06:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb8bda2e445123213823916af9efde53 SHA-1: ba42542da8b0096c3d10b840d500e250c17a335d SHA-256: b22c33cc80f0181f671f2316ed7e8369156a9647ca21d15a9d43bcb1ae19ac0d
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Google sheets templates timesheet' and the malicious URL. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link, likely leading to further malware download 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.cc/pify?keyword=google+sheets+templates+timesheet
    • http://devafo.weekendinquest.org/uploads/1/3/1/6/131606490/wabafakiwafodo.pdf
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/astrology_for_the_soul_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3979/files/nasubot.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/business_intelligence_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/1138/1147/files/heavenly_heat_sauna.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/absolute_phrase_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/the_economist_march_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/3006/7865/files/vijadone.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/readypay_online_registration.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/19477200890.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/34766598049.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1702/files/89043693910.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/83501797154.pdf
    • https://cdn.shopify.com/s/files/1/0433/8601/1813/files/rotation_matrix_2d.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_off00006368.bin
b5f1dba0db99b0a5dc3f2d22cef37b8d68959be7dcd2939aa9234aa751172250
pdf-font-stream PDF embedded font (sfnt) at offset 0x6368 5168 bytes
font_01_sfnt_off000074e8.bin
972a8cfb09011d8bc615046a7a3ef6ad2b3d84fe69acc2d859627d8f3ca298da
pdf-font-stream PDF embedded font (sfnt) at offset 0x74E8 10024 bytes