Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50d13a1bb489f48…

MALICIOUS

PDF

40.6 KB Created: 2020-09-06 13:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da219a7c5a3f6b953f537883b003fa0f SHA-1: d229085f2dd70becf92056df39d2f7add7ddec16 SHA-256: d50d13a1bb489f48013cce88d59a84abd1aad5b05d34d4ed79124fc826a11ea0
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a rental inspection checklist. The ML classifier strongly indicates maliciousness. The document body and embedded URLs suggest a social engineering lure to drive traffic to malicious infrastructure. No scripts were extracted, limiting the analysis of direct payload execution.

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.link/wix?keyword=landlord+rental+inspection+checklist+template
    • https://static.usrfiles.com/ugd/6cfc61_b9e601b908dc4633b94023a27646c924.pdf
    • https://static.usrfiles.com/ugd/bb05c1_71008f24349045879e3df50ab24214b2.pdf
    • https://static.usrfiles.com/ugd/3254bf_710bb8a01c3a46ce8d0ce23311969975.pdf
    • https://static.usrfiles.com/ugd/d1d005_0c210de1d7964a0b8e189fe8911bb901.pdf
    • https://static.usrfiles.com/ugd/a107db_c455ae08ee3c4461a7c9f4d5116864da.pdf
    • https://cdn.shopify.com/s/files/1/0440/2328/3862/files/customer_experience_map_template_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/1746502296.pdf
    • https://cdn.shopify.com/s/files/1/0458/5511/3369/files/vutolabinupeguwunuron.pdf
    • https://cdn.shopify.com/s/files/1/0429/7162/7673/files/44392537751.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/pokemon_crystal_rare_candy_cheat.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/biochemistry_review.pdf
    • https://cdn.shopify.com/s/files/1/0439/0898/9096/files/2132919032.pdf
    • https://static.usrfiles.com/ugd/2c8d66_67c98a6bee284d1dba5d4aede88b82a2.pdf
    • https://static.usrfiles.com/ugd/6f9b04_66b77ff82e9240ccbc9d1266db4fbc4f.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_off000061b2.bin
577865f79ccaba4a66314e4196512603b47bdee1603dd301796d7445c78369f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x61B2 5320 bytes
font_01_sfnt_off0000739d.bin
f99e38f12afd2373d082957a5117a508538ced4f42df447f59d81cc01d030c09
pdf-font-stream PDF embedded font (sfnt) at offset 0x739D 9892 bytes