Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1ad1142914fc90…

MALICIOUS

PDF

53.2 KB Created: 2020-08-30 22:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fd0a8dcfc178fd1fe43f17356511599 SHA-1: d997db5bd0b6699ceada9dcf3784b9c1285a009f SHA-256: 7b1ad1142914fc901461698316e74fcc3886af0af6fb6adc91f0844ecaa4ac5b
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, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains the same malicious URL. The presence of numerous other PDF links suggests a link farm, likely intended to obscure the primary malicious destination and potentially for SEO manipulation. The ML classifier strongly indicates maliciousness.

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.club/wix?keyword=caw+wwe+2k17
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/48f461_8b87945bd2b74561aa83f159f8352c20.pdf
    • https://static.usrfiles.com/ugd/b8c837_716f45f824c24082b3ec5e371a61cbdc.pdf
    • https://static.usrfiles.com/ugd/784815_c95e793200b34c719125bb3b8000871d.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0938/files/givirunetef.pdf
    • https://cdn.shopify.com/s/files/1/0435/7138/0383/files/zopetefosisafebogonod.pdf
    • https://cdn.shopify.com/s/files/1/0436/2856/0547/files/97081665674.pdf
    • https://cdn.shopify.com/s/files/1/0435/4595/2408/files/balowis.pdf
    • https://static.usrfiles.com/ugd/b8c837_909093583bfc4f7880e0198000c6c45a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ac644d0e1a149d2abea4b0a4a9dd6de.pdf
    • https://static.usrfiles.com/ugd/764aaa_5b3deaa0c4284f6ab480468591ea6a58.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e45d570c0464ae5b21a94a66c464f58.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3c5f7b5177842d1a8af5e3d7de42d29.pdf
    • https://static.usrfiles.com/ugd/b8c837_0112edbed89145b9be46dabcb3dd0050.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b8d4db34fb94d73a78dfc389e551d89.pdf
    • https://static.usrfiles.com/ugd/5b604d_51025c294c6349c99dd7338079a47707.pdf
    • https://static.usrfiles.com/ugd/c068f8_4bc29089519e4303925a3a2409d1699a.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_off00007ef0.bin
cc337da913bd21c74cbef05214bc102279219d1cb11d776c882407d94f84532e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF0 4696 bytes
font_01_sfnt_off00008f28.bin
73a3acc61b52bb025ab77a468ce8b828fa63ee9c69157b8e173ff60f6c53a6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F28 10384 bytes
font_02_sfnt_off0000b2bf.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BF 16092 bytes

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