Malicious PDF — malware analysis report

Static analysis result for SHA-256 11524cf5f09d90a6…

MALICIOUS

PDF

39.3 KB Created: 2020-08-19 15:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02e7862dc5986fe6c2b00b2d1e808b17 SHA-1: c6dfe714ed12b3149e38231c3b9a2d6c1e0bbd78 SHA-256: 11524cf5f09d90a6473a1eeec11ab7dc1422a08df494ee592357c120e498f01e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to educational worksheets, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates an attempt to distribute traffic to potentially harmful sites.

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=grade+5+math+variables+and+expressions+worksheets
    • http://files.sewingmachineguync.com/uploads/1/3/0/9/130970014/devigabas-lofitu.pdf
    • http://files.brittmaplesyrup.com/uploads/1/3/1/3/131383456/gaberufukerexunadazu.pdf
    • http://mubom.threesisterstudio.com/uploads/1/3/1/0/131070374/piwax.pdf
    • http://files.eileefahnestock.com/uploads/1/3/0/7/130775017/kugozojekikale.pdf
    • http://fusexa.donslettersfromthenorth.com/uploads/1/3/1/4/131406427/pomopidipaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9490/7810/files/fasinulatumetepekivo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6631/7205/files/checklist_para_diagnostico_empresarial_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/pimugemelotod.pdf
    • https://cdn.shopify.com/s/files/1/0432/4891/0491/files/home_alone_movie_movies_counter.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/crossfire_ph_manual_patch_forum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0776/1819/files/putonapi.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/zatibuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/xixufebuxoz.pdf
    • https://cdn.shopify.com/s/files/1/0447/4011/6629/files/able2extract_to_excel_converter.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/birthday_cards_for_boss_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/4356/8278/files/autocad_underlay_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0435/1809/9615/files/jiwegapezotekedu.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_off00005670.bin
881172b4fe9996aec79f45f8bfea51d47c40000ab1377ff32613b68c1ed44947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5670 5780 bytes
font_01_sfnt_off00006a14.bin
03c5cc0727b3562980aca7cfba31324d4b1524402d36dcbb5d4bd227d2428594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A14 10496 bytes

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