Malicious PDF — malware analysis report

Static analysis result for SHA-256 6476b1ac4b5a87f1…

MALICIOUS

PDF

41.3 KB Created: 2020-09-03 01:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 954d1c2c41bb74b19ee3693ec6e27d61 SHA-1: 254dad7a3dbb40ed85d767b17d03608748c664a3 SHA-256: 6476b1ac4b5a87f113e95a2184c9874319f47bf88293a34f66b5a88f60b7a89d
154 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 a link farm designed to host SEO-optimized content. One prominent link, 'https://ttraff.me/wix?keyword=pearson+education+5th+grade+math+workbook+pdf', is identified as a malicious redirector. This suggests the document is part of a phishing or scam campaign, using educational material as a lure to drive traffic to malicious infrastructure.

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.me/wix?keyword=pearson+education+5th+grade+math+workbook+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c618e9_cdc8d5c052a14725bcd683299c9cd72a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d79861854824991adbe7d2eadd95e92.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d679de417aa405f91780757c8d963ec.pdf
    • https://static.usrfiles.com/ugd/91e123_8169c5190054475285b097d07b52888d.pdf
    • https://cdn.shopify.com/s/files/1/0439/6757/8270/files/video_converter_android_terbaik_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5239/files/93995017939.pdf
    • https://cdn.shopify.com/s/files/1/0429/1769/1559/files/74454429198.pdf
    • https://cdn.shopify.com/s/files/1/0446/5816/3865/files/diabetes_telugu_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/kawulifemaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/30123708986.pdf
    • https://static.usrfiles.com/ugd/7603ae_430b59719d934e3c8b4c267877b5c37b.pdf
    • https://static.usrfiles.com/ugd/3835dd_c8949328b5074328aae7466fe6f0342b.pdf
    • https://static.usrfiles.com/ugd/8ba634_d3b1f80e6c034f7cb74ba545f2465d8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_595645a606b9452192fa9041e802d36b.pdf
    • https://static.usrfiles.com/ugd/3e9e83_c4e7458a63e54e9e93df8721573431f2.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_off000048b1.bin
47768297af434efd8a4a24e4280d9728bd1ccfee963044d07744f46fc5179c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48B1 5960 bytes
font_01_sfnt_off00005ce3.bin
e972ec28b7729d1e10270bdf228eb8b4c69ba264a11775183b2952ed2b40c628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE3 9628 bytes
font_02_sfnt_off00007e15.bin
81d9b4f0e5ec80892d75206a606d9593ba7828bd41e8c4fdeb1f62a39a9962bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E15 17592 bytes

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