Malicious PDF — malware analysis report

Static analysis result for SHA-256 737cbc6bff21c760…

MALICIOUS

PDF

48.9 KB Created: 2020-08-23 06:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed55640d77dc401ca1759f2754a1a420 SHA-1: 38fda8d471bb82dfceff2cea183465e9f290e162 SHA-256: 737cbc6bff21c7608144691b6201d0c27a94d1122f542ef9b367c9968388b5f1
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a lure for 'gmail account password recovery software free'. The presence of numerous embedded URLs, many pointing to benign Shopify domains but others to unknown hosts, suggests an attempt to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious, and the heuristic for a password-protected archive lure indicates a common tactic for evading initial security scans.

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://ttraff.cc/pify?keyword=gmail+account+password+recovery+software+free
    • http://files.positiveposturenz.com/uploads/1/3/1/4/131483550/sivaf_polatafi_zuwovil.pdf
    • http://xapim.vickiegeorge.com/uploads/1/3/0/7/130776031/3773544.pdf
    • http://files.counsellinggoldcoast.com.au/uploads/1/3/1/0/131069812/dinebinasunobonozu.pdf
    • http://files.offmyeasel.com/uploads/1/3/0/9/130969754/9123925.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/75275863290.pdf
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/57753049660.pdf
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/four_syllable_words.pdf
    • https://cdn.shopify.com/s/files/1/0459/2585/9495/files/android_studio_show_toast_message.pdf
    • https://cdn.shopify.com/s/files/1/0436/9114/7417/files/bowanojareref.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/best_fast_android_emulator_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0430/8775/7461/files/panurokizewatux.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_off00007877.bin
7b91ff4f25da7f22506f1411ba6e5181afa3d98bbbda2bb95914d99859d8012e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7877 5588 bytes
font_01_sfnt_off00008b77.bin
fbc30778d74c2a75a770cf54791b362b1fafeec94cd72194ae0946758b246b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B77 13620 bytes

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