Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab07c7f36b49a22…

MALICIOUS

PDF

44.7 KB Created: 2020-10-05 00:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a2a59bb6e674175775cc14d8f9f706b6 SHA-1: e0e3257c73f8eadab6e276446a9cbfa35cbe321a SHA-256: 2ab07c7f36b49a2226d890debac181185cb893b1e7ce4d34b92953e2703ed506
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded links, many of which point to disposable domains and a known malicious redirector. The document body, while heavily obfuscated, contains text suggesting it is an answer key for a worksheet, likely a lure to encourage clicks. The ML classifier strongly indicated maliciousness, and the link farm behavior is a common tactic for distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.link/pify?keyword=concept+mapping+skills+worksheet+answer+key In PDF document text
    • https://site-1036982.mozfiles.com/files/1036982/23233321968.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/vomisolomamegi.pdfIn PDF document text
    • https://site-1042016.mozfiles.com/files/1042016/52320235500.pdfIn PDF document text
    • https://site-1041489.mozfiles.com/files/1041489/vogelinavitugirava.pdfIn PDF document text
    • http://jugub.rusticchalkdecorshop.com/uploads/1/3/2/7/132710773/2393790.pdfIn PDF document text
    • http://files.minotsleeperlibrary.org/uploads/1/3/2/8/132814990/1656448.pdfIn PDF document text
    • http://leruporo.lululops.com/uploads/1/3/0/7/130739101/7755845.pdfIn PDF document text
    • http://xotimawu.mezzanineboutique.com/uploads/1/3/2/7/132712615/46a626.pdfIn PDF document text
    • http://files.lemonlushonline.com/uploads/1/3/2/6/132681576/solusojafawori-nipomuzanevazew-punon.pdfIn PDF document text
    • http://zeloso.abrilliantchildcarecentre.com/uploads/1/3/1/3/131381135/taxozelomi.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/wuwamemaranaxenemulubixog.pdfIn PDF document text
    • https://site-1037858.mozfiles.com/files/1037858/15283672754.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
    • 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_off000062f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F5 5416 bytes
SHA-256: e880852a1e9b1df2a0a746f616e49e2f8c510b93464729a0e0796acdfdc490c3
font_01_sfnt_off0000753d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x753D 10100 bytes
SHA-256: 7553cc5521c823717d484dc0b52474da579c1518f583246da40d5a1fe2b69a8d
font_02_sfnt_off0000979f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x979F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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