Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c1cfdaeed513de…

MALICIOUS

PDF

48.3 KB Created: 2020-08-31 12:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39994b9b3b762ba92f352797651f7abb SHA-1: 2aeb911c6dc41daad70e1a8a966ffc9a6be027d2 SHA-256: 16c1cfdaeed513de02899845efc4d79d9464857b1cf841e90313710d1133236a
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious websites. The primary malicious URL identified is 'https://ttraff.ru/wix?keyword=jerarquia+de+operadores+aritmeticos+en+informatica'. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to direct users to external, potentially harmful content, aligning with a phishing or redirection attack.

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=jerarquia+de+operadores+aritmeticos+en+informatica
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/234f58_11b703253d8f47e4a791b15c82ffc0c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed579ad385854d5c88d434ac03084648.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_95472d04d74c4cf0bb000ef005e6550e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ad48b43fafa4531af53524faa141fbf.pdf
    • https://static.usrfiles.com/ugd/30e015_64961a729ac34a3c8c9fb724c0cc274e.pdf
    • https://static.usrfiles.com/ugd/122077_0f1a0078a8564995bcac51510f4b7b19.pdf
    • https://static.usrfiles.com/ugd/921909_f4133c70e820403c84378ca5b559f12e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddcf71396a3c463a99180d85e72960ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_91436a01911e49eab3aeec83c749f18e.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_989011bc77a34c32ae9777a1caf0b8ed.pdf
    • https://static.usrfiles.com/ugd/b910ae_c6eb04a51a9e472093b96b05a9efdec3.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/71241532774.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9870/files/89993212839.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/php_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/7419552919.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000978b.bin
82e8859af6fa4e3c9044fdddc4f08bdbbec80259d836e7d34658533b89a6e5a7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x978B 17708 bytes
font_00_sfnt_off00006027.bin
a41e6ac64ddb61717e60842bd0a98b33528f32d515fac71a5b12cb1200257d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6027 5384 bytes
font_01_sfnt_off00007261.bin
528b4eae04edc536b8da1e7f8e5d264e8138941eefd6ffd9a3809cddcf969512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7261 11296 bytes

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