Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ccaa92198f3d81…

MALICIOUS

PDF

36.1 KB Created: 2020-08-05 18:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b21de41cb9d8411bfb363ed14ba4f9ad SHA-1: 3b0cae3346d683aaf2476d5ce346e4fe8a36b140 SHA-256: 74ccaa92198f3d81160d593acbd2cfaeda45e7549844feecd057a6c686fe9225
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a malicious redirector. The presence of a 'download button' heuristic suggests a social engineering lure to trick the user into clicking the malicious link. The ML classifier strongly indicates malicious intent, likely to redirect the user to a malicious site or download further malware.

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.cc/pify?keyword=human+body+systems+flip+book+pdf
    • http://files.turquoisetraillavenderfarm.com/uploads/1/3/1/4/131438490/9213591.pdf
    • http://gapimozir.rhiannasboutique.com/uploads/1/3/1/8/131856158/tutemabokono-pibob.pdf
    • http://luwen.tomscot.org/uploads/1/3/2/6/132681394/8107370.pdf
    • http://files.austinburgfirstucc.org/uploads/1/3/2/6/132681460/rosutenorin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/wofum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/bohemian_rhapsody_guitar_solo_tab.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/bigowijimawobetasuzer.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/93234490286.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/raxejugukudebitefirane.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/52103405556.pdf
    • https://cdn.shopify.com/s/files/1/0432/0441/1556/files/waguve.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/zowamosajozodakofomuxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3965/3030/files/minecraft_sign_generator.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/45403447980.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/nafabatabaxojuruk.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/6841633867.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/vojomawa.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_off00004e46.bin
08b394fc2bdb6f3f26f43c6497bdca522d965ed7ccab2002bd2c69f36b4f0ff0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E46 5360 bytes
font_01_sfnt_off00006070.bin
626f46728410835f05deb4214fd524978f1eeabdc1c3daee2e938a795f9028d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6070 10284 bytes

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