Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2faa805f2c8419…

MALICIOUS

PDF

45.7 KB Created: 2020-09-02 00:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee190e1da34bd70054d7183f919532f8 SHA-1: 2459d589a8c944706154482439fcf52a492f1e67 SHA-256: 5c2faa805f2c8419efe0b073b4a957b8af0be091a33b0445cc35cb7f38c7a095
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links that redirect to a known malicious URL, disguised as rehabilitation guidelines. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm or redirection scheme. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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/wix?keyword=shoulder+dislocation+rehabilitation+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/5cd33b_27cb6cb8c9ca4e8cb6d34c2eae182f15.pdf
    • https://static.usrfiles.com/ugd/df4650_0be08cf02887453198104449c9d800f6.pdf
    • https://static.usrfiles.com/ugd/158fb9_476302c4c86d4706a266e396f3499156.pdf
    • https://static.usrfiles.com/ugd/f46427_e1bd1e1488334ebf93dadee10172c103.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/29847234478.pdf
    • https://cdn.shopify.com/s/files/1/0462/0032/4249/files/antithrombotic_therapy_for_vte_disease_chest_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/5067/1007/files/78918378528.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/ganapati_stotram.pdf
    • https://cdn.shopify.com/s/files/1/0428/8407/1583/files/dogijotivagiwisekonenawi.pdf
    • https://static.usrfiles.com/ugd/158fb9_aef703e46ce747c08484b3029d53e2b1.pdf
    • https://static.usrfiles.com/ugd/6f58fb_c1bd1907483c4d1a934e1a529354ba28.pdf
    • https://static.usrfiles.com/ugd/8e1900_b9c4a3053cd24da088d06d019cbdde6e.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663b.bin
52f7d68f0441ae4384a040703be19252ef03bb3529f0266382c4f0bfc153fb47
pdf-font-stream PDF embedded font (sfnt) at offset 0x663B 5328 bytes
font_01_sfnt_off0000783a.bin
03e6136cbd3ca93c3e96df0f0aa2327326aae71ac9c3f5018b478fb7cea8e9e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x783A 10428 bytes
font_02_sfnt_off00009b50.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B50 4324 bytes