Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ad505039a0558a…

MALICIOUS

PDF

39.6 KB Created: 2020-08-22 03:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afc42f14008921a0cae3d1a2461dc4fd SHA-1: a4376781fd45eca81a58f33c68a96a1930d64bca SHA-256: 76ad505039a0558abac4240f0d4f0ae1b29105676b184f17c97849317d19478b
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host other PDFs, with one prominent link redirecting to malicious infrastructure. The document body, though heavily obfuscated, contains the text 'Zombie catcher hack mod apk' and the malicious redirector URL, suggesting a lure for potentially unwanted software or malware. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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/pify?keyword=zombie+catcher+hack+mod+apk
    • http://files.jpgreel.com/uploads/1/3/2/8/132814168/reberudebevovi-negeneriju-saboxor-geteliteluwux.pdf
    • http://zaxido.tgh-judo.com/uploads/1/3/1/3/131383483/7d1858af8cb748f.pdf
    • http://files.joseluisperezjim.com/uploads/1/3/1/8/131871462/7842308.pdf
    • http://tavanarix.kpcecala.net/uploads/1/3/1/3/131383770/kitafituvozowusale.pdf
    • http://files.makesomenoise.online/uploads/1/3/1/0/131070151/9f4c179932f3d04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/vaxukaxawepizujube.pdf
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/27797425757.pdf
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/economic_boom_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/dezogirajononikijoledot.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/xuwixadisowewotuxeko.pdf
    • https://cdn.shopify.com/s/files/1/0441/1277/3272/files/22303263274.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/cache_clear_android_8._1.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/scratch_3._0_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15636630427.pdf
    • https://cdn.shopify.com/s/files/1/0450/9345/3987/files/cervical_cancer_statistics_worldwide_2020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d64.bin
d4c65a6f2f2345061d0bd3e5fa80a3f871e10d710059a5a64bbf5dd925efa3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 5264 bytes
font_01_sfnt_off00006f1e.bin
6c1a23c923742e0ec8b8a9f82438102fcfed263a4966a63eb3679daa52ecf86b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1E 10052 bytes

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