Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e27bd738481282…

MALICIOUS

PDF

43.6 KB Created: 2020-08-14 18:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4dae5e12fbc8e07b2b1c68d0348cd52 SHA-1: b197356a19f68c2b6a1b82c7e705a8f784ccf5b9 SHA-256: 74e27bd738481282257def9e826bd22efefa1ccedbaa9f069860cba444b5bab1
202 Risk Score

Malware Insights

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

The PDF contains a lure for a 'Bitdefender 64 bit offline installer' and includes a link to a known malicious redirector. The document also contains a mass of external PDF links, many hosted on Shopify, suggesting a link farm designed to improve SEO for malicious content. The presence of a security bypass instruction further indicates malicious intent, likely to facilitate the download and execution of a second-stage payload.

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.com/pify?keyword=bitdefender+64+bit+offline+installer
    • http://files.dubelt.org.pl/uploads/1/3/0/7/130739204/powawenux-wibewiwisajetez-junemobe-vijorikixo.pdf
    • http://files.wickedgoodhenna.com/uploads/1/3/1/3/131380915/6160218.pdf
    • http://files.ledgewoodwater.org/uploads/1/3/2/7/132740871/dexozalamu.pdf
    • http://files.shotz.website/uploads/1/3/0/9/130969904/kobivebun_tozuzibumis_mabunumexajeji.pdf
    • http://duzesosel.northlinefarms.com/uploads/1/3/0/7/130776873/viposojerejafofinigu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1955/1388/files/73558300271.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/battle_ropes_workout.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/ruwinawo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/gaxugunovaponog.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/16069946705.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/dorekufejotix.pdf
    • https://cdn.shopify.com/s/files/1/0433/4324/9563/files/1157140517.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/74807528225.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/chromebook_keyboard_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/29890205136.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/bivuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/3761/3461/files/dejevusorijinok.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_off00006cc9.bin
b998cb5c18c09ebf61e0acb04dc9e16bbf3b2bc405d07c04405d2b83b5661f76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC9 5332 bytes
font_01_sfnt_off00007eef.bin
3029aedb6b6000a642be6d31c901f0494b657268f304fc5a69050ff5b43eacfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEF 10184 bytes

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