Malicious PDF — malware analysis report

Static analysis result for SHA-256 6078fc85732fe303…

MALICIOUS

PDF

47.3 KB Created: 2020-08-26 08:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d552ad314849422256e37ac25e266673 SHA-1: c19d238e5cffd7cdea022fd2c3af1384b1d2c427 SHA-256: 6078fc85732fe303e4453a67d84bf1cf49ac590cbe6a3fd253979ff34ba6cf96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One prominent link, 'https://ttraff.link/pify?keyword=adobe+flash+player+12.0+apk', is identified as a malicious redirector, indicating an attempt to trick users into downloading malware by masquerading as a Flash Player update. 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.link/pify?keyword=adobe+flash+player+12.0+apk
    • http://files.clarebrock.com/uploads/1/3/2/6/132681558/7eb1996a4410b.pdf
    • http://files.optimizedcompounds.com/uploads/1/3/0/7/130776817/jujibezen.pdf
    • http://files.tagis.pt/uploads/1/3/1/1/131164122/4731765.pdf
    • http://files.siochantafarm.com/uploads/1/3/0/9/130969370/6523947.pdf
    • http://files.takejake.org/uploads/1/3/2/6/132682899/6881212.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/curacion_de_cateter_venoso_periferico.pdf
    • https://cdn.shopify.com/s/files/1/0434/7291/2549/files/39541798126.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1779/files/96951308152.pdf
    • https://cdn.shopify.com/s/files/1/0429/3001/2316/files/149448707.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/vubegavikebezud.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/kudokizunuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/5383/2609/files/image_asset_android_studio_3._0.pdf
    • https://cdn.shopify.com/s/files/1/0433/5163/8175/files/safix.pdf
    • https://cdn.shopify.com/s/files/1/0439/5335/6955/files/field_attachment_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/liwelobijof.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/zeruwivowur.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/70158130017.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_off0000777b.bin
d94ff6d882baea4b1521cb995bcbc421678274516ca45b3b9f730d4a79c5bfdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777B 5780 bytes
font_01_sfnt_off00008b30.bin
2b67e9ce68572272e20b722d2cfafc4c718c213749d516bee049bbf64f4bd12d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B30 10852 bytes

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