Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d315e5ae6473d16…

MALICIOUS

PDF

106.7 KB Created: 2021-01-12 11:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4c7825667a0388b221555aaa3c3eeeb1 SHA-1: 2839245d25574fefde4b4faa6b5f972890008dae SHA-256: 8d315e5ae6473d166e50c32dfa50e2df2be150d7ab0d50933a605a91c1568aa1
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including one pointing to a known malicious redirector, and is identified as a link farm designed to distribute malware. The document body text, though garbled, suggests a lure related to a "marvel strike force hack mod apk". The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=marvel+strike+force+hack+mod+apk In PDF document text
    • https://site-1174352.mozfiles.com/files/1174352/walowuvewewimusale.pdfIn PDF document text
    • https://zulasiromeg.weebly.com/uploads/1/3/1/4/131453934/zusewunapusomes.pdfIn PDF document text
    • https://cdn.sqhk.co/jagavibejabe/jbhahad/game_box_offline_games_dinosaur.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/NEjeIZH/gin_rummy_plus_download_for_iphone.pdfIn PDF document text
    • https://site-1176272.mozfiles.com/files/1176272/gofazuniziku.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/Xd3Xy3P/world_market_area_rugs_5x7.pdfIn PDF document text
    • https://site-1196822.mozfiles.com/files/1196822/2314485188.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5fc537472a24f.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/jhiihhg/translate_english_to_spanish_by_appointment_only.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/hjPhgij/universe_in_a_nutshell_app_download.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/6144585.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403561/normal_5ffbc118b8672.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/Ncijghg/21167928417.pdfIn PDF document text
    • https://site-1171394.mozfiles.com/files/1171394/cat_leap_on_beam.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/icriagi/graphic_design_blogs_sample.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000160ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AB 5524 bytes
SHA-256: cdb7d7887d0ef977f60f7ff1f71859fa638d988fa798c4375fe3bd7ac0b14222
font_01_sfnt_off00017360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17360 12468 bytes
SHA-256: 7d39ccabce1b397d496e7908d57760f3f7fa8a3aac1ade6343acc5e223b737e1

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