Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3c30fb86cb5508…

MALICIOUS

PDF

41.1 KB Created: 2020-08-29 21:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 210b3da3edf88d93d8e7aca134966a1c SHA-1: c14d71e42cd239ad4471ef18852008e6d311bea9 SHA-256: 6c3c30fb86cb5508fb629f5b86810e73ff0d2ea2f93cdc4d01298ea5c036d10d
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, suggesting an attempt to lead the user to a compromised site. The document body, though heavily obfuscated, contains text related to 'Microsoft office professional plus 2010' and a URL, reinforcing the lure. The ML classifier strongly indicated maliciousness, and the presence of a redirector link is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=microsoft+office+professional+plus+2010+full+version+product+key+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_6e6bf3b3035049a89c9556b8d2cab052.pdf
    • https://static.usrfiles.com/ugd/b8c837_58ab13cd913f46148ffee3d58e94a141.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e245d0cbf3d46e1b6d4f6411a156c38.pdf
    • https://static.usrfiles.com/ugd/b8c837_1aac5195d7cf4d69be7c52fdcdba263f.pdf
    • https://static.usrfiles.com/ugd/824332_36b5efb718a24f959902ef4fc4dac069.pdf
    • https://cdn.shopify.com/s/files/1/0430/0505/1029/files/82004342159.pdf
    • https://cdn.shopify.com/s/files/1/0463/1658/5120/files/kuwuvadomegemonuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/blue_book_of_grammar_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7795/8822/files/36567072281.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_2c44ab44efe642a9821dd30e8957b18a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7df349b8dad545d58ed9b50e11a55cc5.pdf
    • https://static.usrfiles.com/ugd/b98abb_6fef3b10b9014f2093a46a7d9c6dc0d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_33284a30091f4077a062a2edbcfe5c9e.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_off00005366.bin
f99bbb834cef2301ade01bd97649e38d0c02a19e40e2006a1b9a2fb7bbbecaf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5366 5588 bytes
font_01_sfnt_off00006686.bin
9bc62301c2c187da369aaa4987bb1bf5a4ba8379fbe1e09deb8287e0fac05f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6686 10040 bytes
font_02_sfnt_off000088f1.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88F1 4324 bytes

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