Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ef6616226bfbc6…

MALICIOUS

PDF

45.4 KB Created: 2020-08-30 18:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 856962fe25406e1a19c1cee660c96f0d SHA-1: 4f8bcad5352d11e6d690ad283457cedcec69bb9a SHA-256: 15ef6616226bfbc6f588a30cc4869ec44dc2ced55fb25691d8f82e9c5a80372b
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=5+conceptos+de+economia+con+sus+autores
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/luvafov.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/lupegusediwebujiwu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/80330089858.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c465caafb6245ab8528534a815fc2a9.pdf
    • https://static.usrfiles.com/ugd/cdb50c_905ff1196d2344f4a9fe8f4c4731c1fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_81fc907bc36e4398bb460a04ad9e847a.pdf
    • https://static.usrfiles.com/ugd/b8c837_93ba3da61f764956aa760ba5357b868c.pdf
    • https://static.usrfiles.com/ugd/b8c837_91508e7358304576842ae55e365186eb.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_ec6118784f9f43f281b5e1183b0f3aff.pdf
    • https://static.usrfiles.com/ugd/a1fb72_5e4e5f268bea4eadb0735810456919aa.pdf
    • https://static.usrfiles.com/ugd/5438e3_11e3d352fd1e4a40a1bd205c50c842dd.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/nightmare_on_elm_street_6_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0886/0065/files/sujakonezevuwuwax.pdf
    • https://cdn.shopify.com/s/files/1/0435/5817/4883/files/lakufen.pdf
    • https://cdn.shopify.com/s/files/1/0435/2209/7304/files/kangertech_subox_mini_v2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/6521/1035/files/xamilanawesifaguvilug.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_off00006441.bin
0199c70e419406973aac96f8bd4afa8e43364978146c3996c32480596a9f06c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6441 5100 bytes
font_01_sfnt_off0000756a.bin
373e65b3a0a9a0909185e12e53a48794e422b64491bb8da209bf68b8efc6363a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756A 10668 bytes
font_02_sfnt_off0000982b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x982B 4324 bytes

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