Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c9d9f92271aca9…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 11:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9e92141b8b8d63a0a11aa44ee666540 SHA-1: b18248411d87f28cf8ce781ea2976846d81ad16f SHA-256: 72c9d9f92271aca96f2700baedca13cf87cbaf477d006e7ccdd4c9a618974322
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, disguised as a unit converter. The ML classifier strongly indicated maliciousness, and the PDF was identified as part of a link farm, suggesting an attempt to generate traffic or distribute malware. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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=convertidor+de+gramos+a+litros
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_e824070f6e1745b1bfb4cc3cb22c099a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0eb15c813e9b41e5926cdd94b6d46cd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_756280f7b4e343b4939720676291bbec.pdf
    • https://static.usrfiles.com/ugd/b3bc21_4a776438a0b145ecb6c93adb20a1391a.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2557/files/dotukevoginitoni.pdf
    • https://cdn.shopify.com/s/files/1/0434/1035/8439/files/apowersoft_android_recorder_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/3410/8323/files/moviesda_mercury_movie.pdf
    • https://static.usrfiles.com/ugd/b8c837_a25d2ea2402347baa32c25210f26d2f1.pdf
    • https://static.usrfiles.com/ugd/c162b3_058a221c62ef4a65a9dc1dceeb9b4f96.pdf
    • https://static.usrfiles.com/ugd/b8c837_45cafff96f0c4c6e860a84dd12a82834.pdf
    • https://static.usrfiles.com/ugd/b8c837_083f41f33fde4304b5d1a75837768d8c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2c2396210724176abdfc9fe94180e7e.pdf
    • https://cdn.shopify.com/s/files/1/0432/8888/7460/files/satajanorinijajovo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/buxekimavumapagebomot.pdf
    • https://cdn.shopify.com/s/files/1/0430/6137/9226/files/lakemanowefopudi.pdf
    • https://cdn.shopify.com/s/files/1/0451/0292/3939/files/download_biologi_kelas_10_sma.pdf
    • https://cdn.shopify.com/s/files/1/0464/8425/8984/files/nuzivuxix.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_off0000648e.bin
308eab7819da9be53b9af5e7492bc72097365a5299231f704591a4c849aaa4fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648E 5108 bytes
font_01_sfnt_off000075d9.bin
784b5e3bc6cce931a9e666697bef1bff738e1b833f85ed56667bfde0eb8ca6a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D9 12848 bytes

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