Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9938f6b3854162…

MALICIOUS

PDF

47.1 KB Created: 2020-08-03 05:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfaeb748fdf4dce88b32d7b6d513b949 SHA-1: 31dcfbdb06b1e6943ff3714bdbb0c951a0808fcb SHA-256: 8f9938f6b38541622936b29bebdc7d666bed9bf866a5b97939f1a8bcc5062344
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a link to basketball training material. The document body, though heavily obfuscated, contains the same URL. The presence of a link farm heuristic suggests an attempt to manipulate search engine results to distribute malicious PDFs. No scripts were extracted from this sample.

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=basketball+workouts+for+guards+pdf
    • http://files.daisyclaridge.com/uploads/1/3/1/1/131164295/kurisuve-wemipisif.pdf
    • http://files.northerntracker.ca/uploads/1/3/1/4/131452836/wazanezubowuzi-daritase.pdf
    • http://files.baptistelakecampingandstorage.com/uploads/1/3/1/4/131483184/2d985a1add1c.pdf
    • http://files.panteras.info/uploads/1/3/2/7/132712315/1da0872.pdf
    • http://files.spinecarechiropractic.net/uploads/1/3/1/3/131384018/30437.pdf
    • https://cdn.shopify.com/s/files/1/0434/9417/8982/files/68517333860.pdf
    • https://cdn.shopify.com/s/files/1/0440/2577/4245/files/46520408025.pdf
    • https://cdn.shopify.com/s/files/1/0440/1420/7134/files/59890771373.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/gezugawukuret.pdf
    • https://cdn.shopify.com/s/files/1/0431/5624/2589/files/bedugadikokikerilogejipim.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/76384726588.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/86084321017.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/appositive_phrase_examples.pdf
    • https://cdn.shopify.com/s/files/1/0431/6905/4886/files/8_form_tai_chi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/fortune_enchantment_minecraft.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_off000079d9.bin
fc5e10ca53c4251d46699555b4e373fcb56e1ac916fd75672b7323eb63ef7eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D9 5552 bytes
font_01_sfnt_off00008ce1.bin
6a3c12f21d8767ba85a59db1e33d6d76581886182a1b290e93bbead9a9d01127		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE1 10064 bytes

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