Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cb8f0834eb4832…

MALICIOUS

PDF

45.2 KB Created: 2020-10-27 19:12:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8cf8a9dd3fd40a99469b75e1d548b9e0 SHA-1: b8c99e911aea90a5f0275b1335fc34802f6551e9 SHA-256: d5cb8f0834eb48325b2943574f5d895ac25efdd007a3cb54d601dea432f4939c
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=my+lockbox+password+recovery In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_5f8e2f383ce49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8752b10d84b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5f95753842fd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1773/0713/files/best_sniper_games_android_offline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3160/8487/files/league_of_legends_tft_item_build_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1450/7672/files/12832571471.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8203/9964/files/80130794125.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/xoberobewofizotir.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/4584434351.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/64536819864.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6784/1443/files/gears_5_horde_strategy_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6136/1821/files/40671532330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4372/3163/files/moronuzubuzesotasemexivan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9120/0674/files/wadosejixavajowosegunu.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/nokawole.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/kigex.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/flat_belly_diet_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/arcos_de_movilidad_articular.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/tagewigizafufarofelawa.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_off000070c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C2 5596 bytes
SHA-256: 68e8f3aa4fdff5a72d74dc17c6e9a1b2429368e5d34665310b25276cf0a7cbc5
font_01_sfnt_off000083fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83FA 10424 bytes
SHA-256: b620c364cbb498d6daf7f7a43af5f75a7de5a28ac08e399bfdab72d730cc7ff8

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