Malicious PDF — malware analysis report

Static analysis result for SHA-256 c70ed49a54e54f0c…

MALICIOUS

PDF

43.4 KB Created: 2020-10-12 15:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 74884eb7cc2329f4d91b8b7d7bd32094 SHA-1: f2d27355fc12ab1fb2324cf53d038892660cb1f8 SHA-256: c70ed49a54e54f0cc03637215b6361931db9d48e50e9e003e2c3ba1549a1f0af
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that mimic IRS instructions for Form 8812, a common lure for phishing. The primary link directs to a known malicious redirector infrastructure, indicating an attempt to lead the user to a malicious site. The document's structure and numerous links to disposable hosting further support its role as a malicious lure.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=irs+gov+form+8812+instructions In PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/26952088843.pdfIn PDF document text
    • https://site-1036832.mozfiles.com/files/1036832/gilujumo.pdfIn PDF document text
    • https://site-1040006.mozfiles.com/files/1040006/jejogudaduge.pdfIn PDF document text
    • https://site-1043537.mozfiles.com/files/1043537/barib.pdfIn PDF document text
    • https://site-1037214.mozfiles.com/files/1037214/geletopotigixubut.pdfIn PDF document text
    • http://pujobo.mmjpartyrental.com/uploads/1/3/0/8/130813840/xilukejekezo.pdfIn PDF document text
    • http://files.radiotvevangeliquedelagrace.com/uploads/1/3/1/3/131378930/53598.pdfIn PDF document text
    • http://files.kdeegear.com/uploads/1/3/2/8/132815370/a8ca1d.pdfIn PDF document text
    • http://files.youth-forward.org/uploads/1/3/1/6/131606268/bumufelene.pdfIn PDF document text
    • https://site-1040977.mozfiles.com/files/1040977/jifomivevujemavipip.pdfIn PDF document text
    • https://site-1042785.mozfiles.com/files/1042785/89348537039.pdfIn PDF document text
    • https://site-1040374.mozfiles.com/files/1040374/fudiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/58465c36-3cf7-4e07-a2ca-077c65c3a4b1/47049366841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a45620-c8d5-4273-8fab-0be28bc4672d/56528419039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31618710-6906-4c9b-8b2d-262e51446ad3/89458309442.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A30 5336 bytes
SHA-256: 56758857fa407e455ba7ce0604a7442e4c15c74b6fc984047d3aefa7f9b113e1
font_01_sfnt_off00007c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C50 10760 bytes
SHA-256: 75f1edb30419d812d5e957b45448b54712f10faca8e73672205f03eb35a16cbe

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