Malicious PDF — malware analysis report

Static analysis result for SHA-256 7803a5696f9e30e5…

MALICIOUS

PDF

34.2 KB Created: 2020-08-24 17:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3488f81054fa670c4d93a5649ed20331 SHA-1: a713e8570874fe9721cd96462c29615fcd59269d SHA-256: 7803a5696f9e30e5f8bae20f6c0105322bd75d5a19dea4940a8bc4f7ee46951d
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains URLs that suggest a link farm or SEO manipulation tactic, likely to obscure the malicious redirector.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/pify?keyword=consternation+and+distress+crossword+answer
    • http://files.forestcitycremation.com/uploads/1/3/1/3/131381640/sogab.pdf
    • http://files.iguanamama.com/uploads/1/3/0/9/130969358/1776844.pdf
    • http://files.mountforesthomecoming.ca/uploads/1/3/0/9/130969993/1840098.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4798/4026/files/bournemouth_vs_man_utd_match_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5710/files/tunibolakewav.pdf
    • https://cdn.shopify.com/s/files/1/0462/7690/3061/files/alarm_app_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0440/6912/6309/files/report_abandoned_vehicle_texas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/tazidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/biologically_important_nucleotides_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0432/4265/1816/files/gurps_character_sheet_gcs.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/mars_inc_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0441/2227/5992/files/swisher_brush_mower.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/bsc_5th_sem_physics_notes.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_off000048b9.bin
ab625fdb6f5ccd0ad8baf8b000e9f3e1b9f07fca684d13fe5defcf0c87f8a0cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x48B9 4896 bytes
font_01_sfnt_off00005976.bin
733a2cacc76304d6a8e4e06477288526b6f744e72a92ed60cd24cb43a59a4b9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5976 10096 bytes