Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bfa0e3fa9fae6c…

MALICIOUS

PDF

42.4 KB Created: 2020-08-25 21:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9de558df85cbcd24c74630dcf5a9b95e SHA-1: 5f8d54be5eea608913bcce6749c686e1aa9fd0d5 SHA-256: 18bfa0e3fa9fae6cebce487a5d394664bd5f434e032bb8fe1c08b26e12ba609d
154 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body also contains this URL, suggesting an attempt to trick users into downloading software. While no scripts were extracted, the presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to distribute content, potentially malicious. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=rack2-filer+v5.0+full+version+for+pc
    • http://files.hoopspulse.com/uploads/1/3/1/3/131378950/1003228.pdf
    • http://files.detroitvga.com/uploads/1/3/1/4/131409309/nebenaj-wupefudutijak-mosaxerijivakis.pdf
    • http://files.smarterbites.org/uploads/1/3/2/7/132712214/xuvorop_resopofogopam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/92559281012.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/python_remove_n.pdf
    • https://cdn.shopify.com/s/files/1/0451/4103/3114/files/chicken_invaders_5_full_version_pc.pdf
    • https://cdn.shopify.com/s/files/1/0432/9570/3204/files/matplot_lib_create_animated_frame_with_widgets.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/peworawek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1568204463.pdf
    • https://cdn.shopify.com/s/files/1/0434/6229/5714/files/ammocoete_larva.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/datefotaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/dobetowenikakudafudok.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/77146313655.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5271/files/gubbi_mele_brahmastra_kannada_movie.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/84146184163.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_off00006616.bin
9ad34c142cbe2098e7689928867d53dc3a952d914e4f7f965cf27ce6ad980b92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6616 5604 bytes
font_01_sfnt_off00007942.bin
ff0389f3ec01d6917df8e4857e7927a167686361451853fe42afe27c28146239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7942 10440 bytes

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