Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e45b2f549671b5c…

MALICIOUS

PDF

41.3 KB Created: 2020-09-02 01:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b5a68ee6d771bbf2de62b63f4ad4c55 SHA-1: da4fca9c84daf898f0b8ca2d16dd9514cd659d38 SHA-256: 7e45b2f549671b5c0353ad816ea8305aa5a21c8275d594509fd3a453c392bbec
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently pointing to a known malicious redirector. The heuristic firings indicate a malicious redirector and a link farm, suggesting an attempt to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection scheme.

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.com/wix?keyword=automatic+transmission+gearbox+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7097/1299/files/senadadizujuzufuwori.pdf
    • https://cdn.shopify.com/s/files/1/0435/0024/1061/files/93296418391.pdf
    • https://cdn.shopify.com/s/files/1/0452/4104/1057/files/baweg.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/pukalola.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5031/files/crash_twinsanity_iso.pdf
    • https://cdn.shopify.com/s/files/1/0434/8179/2677/files/grade_5_math_worksheets_fractions_decimals.pdf
    • https://cdn.shopify.com/s/files/1/0439/8609/2190/files/blind_melon_no_rain_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0434/3745/7575/files/colbert_report_correspondents.pdf
    • https://static.usrfiles.com/ugd/defdb4_dc3575454db84b948ee6ea67e41e37de.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_47e79386c7c94b9bb9b679b32f4096ec.pdf
    • https://static.usrfiles.com/ugd/97368a_f798e7d3e71d4b598ffcb748bdd10348.pdf
    • https://static.usrfiles.com/ugd/165585_e3d11f6355f94741a8a8d39d03d74afb.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_afe86e7e59fc463fb2bcbd5428497827.pdf
    • https://static.usrfiles.com/ugd/3de8a6_73ea779c2ef34607829a6b68070d5b5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_98354f1194a24134a6492c032af1aa61.pdf
    • https://static.usrfiles.com/ugd/fd3290_8c7a833cf5964a7ebe788119bac50f98.pdf
    • https://static.usrfiles.com/ugd/b50c55_6d2d9a592d624d4daf377b61791c0555.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_off000062f3.bin
acda47572f711b1b119bb5b0686aadbc3c46eed05be7e0657927e0c2b1640c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F3 5640 bytes
font_01_sfnt_off00007602.bin
f16b01166d0ca2a6608e7ef65ada9bf0a4b54f1556bd5c70168545ae19d31f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7602 10040 bytes

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