Malicious PDF — malware analysis report

Static analysis result for SHA-256 74da4bf667fb7cad…

MALICIOUS

PDF

41.1 KB Created: 2020-09-01 19:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0420ac7be4073546f4519b8f1b99d1b SHA-1: c2340da3c6ca1a41baa7fb1311bfc2a85e1cc994 SHA-256: 74da4bf667fb7cad03798b489d0f20c4844ec0415889720a48f3c7cd43ed4abe
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a modified application. This suggests an attempt to trick users into visiting a malicious site, likely for malware distribution or phishing. No scripts were extracted, but the presence of many links points to a common PDF-based lure technique.

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.cc/wix?keyword=kaspersky+battery+life+mod+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_b2c3427f58f145edbda03a8c7c7d935a.pdf
    • https://static.usrfiles.com/ugd/40b9e6_95061b7bdb5b4e64825684ede1f103f2.pdf
    • https://static.usrfiles.com/ugd/6d59ab_55fb074243fc4a55b9fcd466d9778048.pdf
    • https://static.usrfiles.com/ugd/9e41f0_24bc9e64f06b49eea96a707f8e161aef.pdf
    • https://static.usrfiles.com/ugd/df4650_bfbe6d8585864c0f866ca8a2ca619090.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1792/files/5610409880.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7238/files/eshop_codes_no_surveys.pdf
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/fetew.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/98245632819.pdf
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/9055312955.pdf
    • https://static.usrfiles.com/ugd/b8c837_a107a1d0827641bd97289a95c729bf0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5de571aa4a814e74853fd86afeb77d14.pdf
    • https://static.usrfiles.com/ugd/b4a829_631cfe0489474f79a97184b1930c0547.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/wemakaloperugipikorazubal.pdf
    • https://cdn.shopify.com/s/files/1/0436/5297/2697/files/87150611118.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_off00005592.bin
39113573ad696922da4956ff47e622652ef74237fff259521d6ea5950f5338cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5592 5144 bytes
font_01_sfnt_off0000671b.bin
19a55e079161c6ffe6cbef2ce6fb471c42143a74c2c0bf54df7806feb5e87f05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671B 10088 bytes
font_02_sfnt_off000089ac.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89AC 4324 bytes

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