Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9b7a5b222de7c2…

MALICIOUS

PDF

70.8 KB Created: 2021-01-20 14:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9de112caebbe29a725b56eccf1f83f09 SHA-1: 9a282c91d1629b958ced54a991e33edbcf795be5 SHA-256: ac9b7a5b222de7c2567c5cb888680543af73c9fe6806ab6036a3612e7cdc271f
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'boat renaming ceremony', likely a pretext to disguise the malicious links. The presence of embedded URLs and the link farm heuristic indicate an attempt to direct users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/123?utm_term=boat+renaming+ceremony
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/pasadilekef_xaxamofisogavaw.pdf
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fe29c04029b0.pdf
    • https://site-1178710.mozfiles.com/files/1178710/talolinogopuvomuboma.pdf
    • https://site-1178429.mozfiles.com/files/1178429/banner_template_minecraft_photoshop.pdf
    • https://cdn.sqhk.co/duzoxibuf/7uhjNgg/kiss_of_war_sniper_ad.pdf
    • http://pasozabijegigus.iblogger.org/free_big_puzzle_pieces_template.pdf
    • https://simalono.weebly.com/uploads/1/3/1/8/131856945/lasasunig.pdf
    • https://powumebaporisav.weebly.com/uploads/1/3/4/8/134891471/xafutudinodege-zumixupe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rawesaragegugar/xalutavi.pdf
    • http://walefofu.rf.gd/87713107467.pdf
    • http://puguvapalovuzub.rf.gd/bafg_hamburg_formblatt_3.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/66549695925.pdf
    • https://s3.amazonaws.com/rodiligarexo/52657131583.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_off0000daa1.bin
7715c8cfa82afd4f820c489b273894db844a5f8d2bec10db9e9624c9cf128fba
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA1 5060 bytes
font_01_sfnt_off0000ebcc.bin
3f375c359f10a5f1ee60c81c139895d6d75491fbc5e279e66a9c26b363aa0d42
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 10096 bytes