Malicious PDF — malware analysis report

Static analysis result for SHA-256 775d34f5b7c80be6…

MALICIOUS

PDF

41.7 KB Created: 2020-10-31 02:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8df5bc59aee98b06242fd0ef72ac75b SHA-1: 9ec0c03e1be1327e758e10b5869ead937ab381cc SHA-256: 775d34f5b7c80be69158341aa09aaa4b2de3c59dd47e8d5041e33bd3bd8dd414
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that directs users to a URL seemingly related to obtaining premium software. 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 URLs are the primary indicators 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://gettraff.ru/strik?keyword=how+to+get+spotify+premium+apk
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f875886aa7da.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dorulusof/97734928482.pdf
    • https://uploads.strikinglycdn.com/files/0d94f5d8-a9c9-41bd-a335-01271e9da6a7/i_ll_never_leave_you.pdf
    • https://uploads.strikinglycdn.com/files/a801213c-cbce-4369-8f93-7585cd63904d/pexozar.pdf
    • https://uploads.strikinglycdn.com/files/9182667c-277b-48d9-ba05-fd96300748fc/56547823112.pdf
    • https://cdn.shopify.com/s/files/1/0496/9355/6893/files/39238020690.pdf
    • https://s3.amazonaws.com/jinabisura/bacon_and_butter_keto_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0485/2478/7867/files/knit_bikini_brand.pdf
    • https://uploads.strikinglycdn.com/files/38074457-0c65-44e2-84b1-d4c06a4a3e0d/faruk_k_azar_azar_mp3_indir.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/71243198087.pdf
    • https://s3.amazonaws.com/fekaduvopigab/luvemutenikosafekaxivafi.pdf
    • https://uploads.strikinglycdn.com/files/5e57cabd-4243-45b1-9bbe-fbab0d3b11bc/28777802760.pdf
    • https://s3.amazonaws.com/tesodagiwor/caballo_de_troya_en.pdf
    • https://uploads.strikinglycdn.com/files/ae2f2f83-0499-4799-81ad-d3ac8d6da98c/82531429306.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_off0000637d.bin
0eff467e7cd379974ed6961f0dc7d0ba3d434c29b655f2900ac941470a30c595
pdf-font-stream PDF embedded font (sfnt) at offset 0x637D 5408 bytes
font_01_sfnt_off000075f0.bin
670fb938a87aaba04b3fc7556944744bfae1755a9bb02bd636aaba65ac5c35a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x75F0 10648 bytes