Malicious PDF — malware analysis report

Static analysis result for SHA-256 797a9eeb85f4accc…

MALICIOUS

PDF

47.7 KB Created: 2020-08-29 21:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2dc8b535a6519de3ed23d46c96c9e62 SHA-1: e04464a361da6fc4311d4b19df010dd05c8c8b38 SHA-256: 797a9eeb85f4accc2ff5e3086a7f25ae1bf610e0f84b2437ff5538573f709f66
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL and a list of other PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious link, likely leading to a further stage of infection.

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.ru/wix?keyword=ardublock+tutorial+pdf+fran%25C3%25A7ais
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_c3ae09e087aa487a9991ec7759c3ef61.pdf
    • https://static.usrfiles.com/ugd/b56239_30042b0174734f78bac04bc399026da1.pdf
    • https://static.usrfiles.com/ugd/3b0c81_69420c9b84f247439658da7f8cbe9861.pdf
    • https://cdn.shopify.com/s/files/1/0432/4160/3239/files/mixed_fraction_calculator_in_simplest_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/53409281544.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1780/files/jesipalum.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/free_business_card_template_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/40149924655.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/bigo_apk_hile_indir.pdf
    • https://static.usrfiles.com/ugd/5e8de6_8911405025d2449d829cb79b46125ae2.pdf
    • https://static.usrfiles.com/ugd/a382ee_88c8498cf84c4f888f673d976db71a1a.pdf
    • https://static.usrfiles.com/ugd/0047a4_21c476d4120a475591c98e0f948c246d.pdf
    • https://static.usrfiles.com/ugd/b8c837_14d5b98d8a524ed79a238b69e8ec879b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1074e07e95a047e0bbf8a828a259661f.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_off00006d12.bin
90aa9438f4c76086bdacd65fba505d45f371e5df358a0b27cea6b61e0d5b7d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D12 5288 bytes
font_01_sfnt_off00007ebf.bin
c295ca98ecbeebcf8422499dc1f9583d1d7573e6c50598e59a6bd9b5ba0842fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EBF 10368 bytes
font_02_sfnt_off0000a1fc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1FC 4324 bytes

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