Malicious PDF — malware analysis report

Static analysis result for SHA-256 6238ec41e66f04a1…

MALICIOUS

PDF

44.6 KB Created: 2020-08-10 18:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0e8be265eccf5e82d7572612b46cbcf SHA-1: 2dc25e5d2c33f57070ac0d3d4389ab8a75ce2835 SHA-256: 6238ec41e66f04a160b9f21cc2f815dcea778a8f8238456169a34e8e7195eab1
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including a link to a known malicious redirector and a large number of external PDF links, suggesting a link farm. The document body and heuristics also indicate a social engineering lure, presenting a fake download button and instructing the user to install a browser extension or update, which is a common tactic for credential theft or malware installation. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ttraff.cc/pify?keyword=pdf+split+free+software
    • http://files.friendsofcharliesplace.org/uploads/1/3/0/7/130775537/buzolujibakov.pdf
    • http://files.themedievalmonk.com/uploads/1/3/0/8/130814129/ruxixovobedaj_xoruwanatasob.pdf
    • http://files.isobelchurch.com/uploads/1/3/2/3/132302894/2558091.pdf
    • http://files.decgallery.com/uploads/1/3/1/3/131384789/cc8b20d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/wikowedidorage.pdf
    • https://cdn.shopify.com/s/files/1/0437/1575/6181/files/stardew_valley_ocean_fish_bundle.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/vezunaxudasekis.pdf
    • https://cdn.shopify.com/s/files/1/0435/8176/7848/files/27634558304.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/7426555230.pdf
    • https://cdn.shopify.com/s/files/1/0441/2289/8584/files/arquitectura_sostenible_libros.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/minecraft_fantasy_mods.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6079/files/bawelomorazolopobudipu.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/meradov.pdf
    • https://cdn.shopify.com/s/files/1/0433/7611/5863/files/html_to_php_laravel.pdf
    • https://cdn.shopify.com/s/files/1/0430/5960/9753/files/61628313287.pdf
    • https://cdn.shopify.com/s/files/1/0437/3312/3221/files/78543071566.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_off00007024.bin
ebe5ca27f8cfc74cd9948df462f990ba1813438666d0cf3a8a133f5ab7c47751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7024 5128 bytes
font_01_sfnt_off000081b7.bin
9457d20dd12a2e00af9407d60c05dbca8a3016dc2403bad41750e6e01a7d3ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B7 10616 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.