Malicious PDF — malware analysis report

Static analysis result for SHA-256 605a774cc06ec70f…

MALICIOUS

PDF

56.7 KB Created: 2020-09-12 16:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08c824d16f6dcb17272bc4c25bc6468d SHA-1: 9f47fb83ff0eafb9a63ad7662ec406cf2c81512d SHA-256: 605a774cc06ec70f4b571f6ea039251a925fddcfa81ce6fff52abe02fd8b4fe5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

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.me/wix?keyword=aparato+locomotor+del+perro+pdf
    • http://files.dreamingbigpublications.com/uploads/1/3/1/6/131606121/muropa.pdf
    • http://befate.shekkacomputers.com/uploads/1/3/1/4/131411688/2278072.pdf
    • http://rotenow.courtneysuzannelee.com/uploads/1/3/2/6/132682076/wijekirisigoni_mezonarem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/625844_fd55a94e25784b64a5ac24fddee39638.pdf
    • https://static.usrfiles.com/ugd/9f2514_7f723f654f684208b2a7ee97a1443431.pdf
    • https://static.usrfiles.com/ugd/05e3ad_526465fb5f5c458b89a1ac629f291a93.pdf
    • https://static.usrfiles.com/ugd/4cf28d_83e1f8bf573e438db4d751db39751e5b.pdf
    • https://static.usrfiles.com/ugd/97368a_ed6326bdb88b4632be493cdafb47f5e0.pdf
    • https://static.usrfiles.com/ugd/007d40_9f3d5fdcb75e47be867855ebbc6b5018.pdf
    • https://static.usrfiles.com/ugd/6203b9_d55e6af0698940f786ea92bcd0da1bb3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009cf5.bin
03ab4fc58c25b36ca7d4413c255a0f85dc19555beb11d4a7a7c1cf9d03591fef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF5 5112 bytes
font_01_sfnt_off0000ae46.bin
3b9dcaded35b4970bd132c5b1e2ad6dd71e2384f5669964df18085944b881e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE46 11992 bytes

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