Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ddf37e1187f62f…

MALICIOUS

PDF

37.7 KB Created: 2020-08-07 08:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e1a63dc1a5ea2752dbc4d5698291fac SHA-1: 6dc364bfc8cb89eec2604aa420c5deb95f4c6967 SHA-256: 71ddf37e1187f62ff4514d3925fc43b858cb9329f58548640a46d7b4f4b1f46d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'https://ttraff.ru/pify?keyword=mallorca+albeniz+guitar+pdf'. This suggests an attempt to lead the user to malicious content, possibly for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=mallorca+albeniz+guitar+pdf
    • http://files.hafcafproductions.com/uploads/1/3/2/7/132740900/7999060.pdf
    • http://files.seejillteach.com/uploads/1/3/1/8/131856072/gepiweg-vonopa-xavivuvozido-zubekosi.pdf
    • http://files.mrpict.com/uploads/1/3/0/9/130969330/bibawujuxako_misazotejibepiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/70079645001.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/jegelage.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/93227189572.pdf
    • https://cdn.shopify.com/s/files/1/0429/6284/5859/files/53610007039.pdf
    • https://cdn.shopify.com/s/files/1/0437/0789/1877/files/87404077640.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/mofonel.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/download_zoom_recording.pdf
    • https://cdn.shopify.com/s/files/1/0438/7058/4987/files/duwifakuporigusid.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/62898254518.pdf
    • https://cdn.shopify.com/s/files/1/0430/5397/3657/files/english_grammar_adverbs_of_frequency.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6133/files/bamepumepunokedan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/20823523761.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/8605357814.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048e4.bin
d7b867d701fef03bdd3fb0cc75e2935f96df3346f6dde1141aa33dbab1291136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E4 5220 bytes
font_01_sfnt_off00005ab9.bin
f112c7cc73d5e37b6a45157d7f6a2e821c6172af1878651e4a2fb3d9e6663145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB9 9640 bytes
font_02_sfnt_off00007bd6.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD6 4324 bytes

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