Malicious PDF — malware analysis report

Static analysis result for SHA-256 077fcb63120dbbb3…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 10:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9d261756d957b8263869e1ddf3b2aa8 SHA-1: 7fe1b768818db216e6de429ab8c057fe6c6abe83 SHA-256: 077fcb63120dbbb311efcd4e4301f15279a38249eec3d5999ec1043c98a5e3a0
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The presence of a 'download button' heuristic further suggests a social engineering attempt to trick the user into clicking the malicious link. The ML classifier strongly indicates malicious intent.

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.
  • 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=killer+joe+benny+golson+pdf
    • http://files.firstnewark.com/uploads/1/3/0/8/130873995/nimifubewizinikabaw.pdf
    • http://files.galadays.ca/uploads/1/3/1/3/131380126/ladamodu.pdf
    • http://files.sharkbaitbeachcam.com/uploads/1/3/0/7/130738960/1721832.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0341/2633/files/gegugafusekumo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5833/8715/files/47130540455.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2580/files/seconds_to_days.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9252/files/pijobexatafove.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/23834169078.pdf
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/16123624451.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/vekemawuferorem.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/lozanoje.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/energy_drinks_health_risks.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/honda_gcv190_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/komiladewoju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fasexerogetotano.pdf
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/51902655118.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/bewunig.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_off0000684d.bin
ca6962ad4f7ec7b5a5ec81c4edc0d8ceade258ec2d685dacf267e2b34663e3af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684D 5288 bytes
font_01_sfnt_off00007a6b.bin
11238922e0e46910e19efabd0e90cacce9a59e76284eaa782b85ac78ae1af281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6B 10132 bytes

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