Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3f4d43c0c19697…

MALICIOUS

PDF

45.7 KB Created: 2020-08-20 14:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47db836302b16166908b94d85110c187 SHA-1: 5d64af107c3e6bf9059d450fcc88fb0518490daa SHA-256: 5b3f4d43c0c19697c1b80465a23a09c7c89f10916e6088040d1a5127862e3588
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or suspicious domains. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a phishing or redirection attempt. The primary malicious URL identified is ttraff.ru, which is used to redirect users to content related to software downloads, likely as a pretext for malware delivery.

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/pify?keyword=dot+net+framework+3.+5+windows+10
    • http://files.bensonbunnies1971.com/uploads/1/3/1/3/131379213/mefigesoge-gomomojivuteja.pdf
    • http://files.myteamtriumph-georgia.org/uploads/1/3/0/9/130969150/favuzu.pdf
    • http://files.mpowertheworld.net/uploads/1/3/2/7/132740415/kadisetiwebuget_rofajanagojata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0433/6353/2951/files/likabimunit.pdf
    • https://cdn.shopify.com/s/files/1/0434/9978/2309/files/pyqt_stylesheet_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/3963/7155/files/bsff_anleitung.pdf
    • https://cdn.shopify.com/s/files/1/0434/4040/6684/files/xagarovabepuzawabepusex.pdf
    • https://cdn.shopify.com/s/files/1/0440/1371/5606/files/digital_business_concepts_and_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0437/7421/4306/files/assinatura_digital_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/68757398444.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/26431_shoreview_avenue_euclid_oh.pdf
    • https://cdn.shopify.com/s/files/1/0439/0453/2648/files/tezotexusunawosonogore.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/xatun.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e34.bin
26df74c3d0ffad3c7fd330fc20dcc81f5fdbe10c1968bc90d7d2680db000baff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E34 5688 bytes
font_01_sfnt_off0000719c.bin
a970eb77ce378cdbda22b0a5ce059aa771ceace4f097cb6f580434b0abd3c690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719C 10200 bytes
font_02_sfnt_off000094ae.bin
792b17e2d8b7926bbf982488bb4a17e77740ea3a38fff94c5bbd2958d4a1dfd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94AE 16120 bytes

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