Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f7b5e24acfeb8c…

MALICIOUS

PDF

80.5 KB Created: 2021-02-18 22:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c0efc6026f5301a98bef82f9c3a07291 SHA-1: 420e6142465996b0c99164150da0f200fcac3f16 SHA-256: e9f7b5e24acfeb8cc45cd7574687b7de4cfd532896872a1f6db68a07c8e4fe48
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms designed to distribute malware or lead to phishing sites. The heuristic firings indicate the PDF is acting as a redirector and contains a link farm, with one critical finding specifically identifying a link to a malicious redirector. The document body, though heavily obfuscated, contains keywords related to 'free followers apk download games', suggesting a lure for potentially unwanted or malicious applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/wix?keyword=free+followers+apk+download+games In PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/ruzumefutolodomaxij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6013cbd425ab8.pdfIn PDF document text
    • https://wurewoji.weebly.com/uploads/1/3/1/4/131438788/zapudadunaredux-zavekukovumane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5fdf00c92463c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413703/normal_6001d5abcd4c5.pdfIn PDF document text
    • https://vakilelem.weebly.com/uploads/1/3/1/3/131379598/zenedabuxowewi.pdfIn PDF document text
    • https://vejewumuwuwaja.weebly.com/uploads/1/3/4/7/134759129/difugerajov.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/3585950.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/online_video_er_from_facebook_link.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/gewiluzofijodojepubanegad.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/12208967971.pdfIn PDF document text
    • http://nivomijerunaz.epizy.com/wepotuvekasofunuwufafituv.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/tukazenawunuxerijovo.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/how_to_use_biodegradable_waste.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/78759705722.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/63375144538.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/gta_san_andreas_mod_apptoko.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/lemikeladeromume.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 5132 bytes
SHA-256: 79cdee6e2f1973d620f42de8b77857d4cfb67f85415d069413748c7407bcab5c
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10480 bytes
SHA-256: ae7892cf6f19d0c98cd09a740d167ca6f81bad706d0658a3e80216a4497c0e38
font_02_sfnt_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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