Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa7c51aa702aa1f…

MALICIOUS

PDF

42.1 KB Created: 2020-10-27 17:24:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bf1b51620e89f31d82e50031837d5917 SHA-1: 93b0e1c9865edb1b562b033ba01582fb55923b1d SHA-256: 1fa7c51aa702aa1f2f1b75ea6b7794679bb0953c2c4950a91e1b00e6eb6f9451
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector, suggesting an attempt to trick users into clicking it. The ML classifier also strongly indicated maliciousness.

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 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://cctraff.ru/strik?keyword=concurrent+collections+in+java+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f9688b3d1494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_5f97438922429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402724/normal_5f937af2d3940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f95ed4986c28.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/noxigazedesupod.pdfIn PDF document text
    • https://beperiguvo.weebly.com/uploads/1/3/4/3/134320750/wupate.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/fupukodew.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/da9af3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/tamipobavuw.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/60259302203.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/92023150054.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/fixonowumonufof.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/81054653345.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/1209/6678/files/52599629657.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1610/8701/files/zener_diode_practical.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/pukosekowowagowegin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3701/0331/files/great_gatsby_chapters_4-6_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5053/5578/files/faraway_forest_cave_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8307/0629/files/tixunizasatuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8789/7787/files/83132312255.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_off000067c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C7 5188 bytes
SHA-256: bd3d10f00a52cd644ad02cd33dd2f25c939cdc7c28399b4ef182523746751f8f
font_01_sfnt_off00007980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7980 9832 bytes
SHA-256: f78581634156005a097554b678b97f290ecf69786bcabebbafffa4d9dc30f1a3

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