Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ea8b24e0fbfdd9…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 07:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d21e3e5fa1c0b0039c96e6bb7ae29609 SHA-1: 24085806b29ed62e48cefb1f7bcc8b7fc4a1ca20 SHA-256: 99ea8b24e0fbfdd931257745ddd1ab177e562828d26ed27beea96f044b245e74
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'probability worksheet for 7th grade pdf'. The PDF also contains a mass external PDF link farm, with many links pointing to shopify.com, likely for SEO manipulation to increase the visibility of the malicious redirector.

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=probability+worksheet+for+7th+grade+pdf
    • http://files.btmpostech.com/uploads/1/3/1/4/131410818/tojupujev_wavakevajuriwu_vuwamerodevo_zukapanajonun.pdf
    • http://ruxewa.tell-consulting.com/uploads/1/3/2/6/132681670/962b2e3.pdf
    • http://files.meridiancyclingclub.com/uploads/1/3/1/4/131408581/2743413.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojedisubeweful.pdf
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/cbse_syllabus_for_class_11_physics.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/22604262733.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/6202208429.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5404/files/devatiwasajenazenewek.pdf
    • https://cdn.shopify.com/s/files/1/0452/8783/3762/files/human_anatomy_8th_edition_marieb.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/anthony_robbins_books_greek.pdf
    • https://cdn.shopify.com/s/files/1/0436/0113/3731/files/febivigefawibozegawupe.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/tight_pants_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/kirefujoxuzuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/72670731109.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_off000064c0.bin
7c548c2b42f849d0a0ce48a1a900eadd55b3f27524e8a0034a76d84299d6e53b
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C0 5784 bytes
font_01_sfnt_off0000787e.bin
8b55d720e5335afbdf9f7769b5e9453d2e46ab146bafbab2ac6fd43733230523
pdf-font-stream PDF embedded font (sfnt) at offset 0x787E 10540 bytes