Malicious PDF — malware analysis report

Static analysis result for SHA-256 658857f855475f2c…

MALICIOUS

PDF

50.2 KB Created: 2020-07-30 14:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf0f01cd1aad6e5f216b0a088d5a62c SHA-1: b2ea2d7b2e8f37cabe3842bec7c9127692dbb84e SHA-256: 658857f855475f2caa16b38c5a77e2497cc21f2e2611b8a9b5508b61a6c6288b
162 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as a free download for an engineering textbook. One of these links, https://ttraff.com/pify?keyword=irrigation+and+water+power+engineering+by+punmia+pdf+free+download, is identified as a malicious redirector. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=irrigation+and+water+power+engineering+by+punmia+pdf+free+download
    • http://files.peacepartners.co.uk/uploads/1/3/2/6/132681479/2a52deff7.pdf
    • http://files.manchesterctpal.org/uploads/1/3/0/7/130775668/aa6966b37c75f.pdf
    • http://files.shaindeesmakeup.com/uploads/1/3/0/7/130739444/8812125.pdf
    • http://files.showdownvapor.com/uploads/1/3/1/4/131437044/tulujijujer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/42951528614.pdf
    • https://cdn.shopify.com/s/files/1/0432/0693/4688/files/62108175765.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/nejaxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1671/5429/files/23504680023.pdf
    • https://cdn.shopify.com/s/files/1/0435/1387/2548/files/sajumapituka.pdf
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/fudotefotik.pdf
    • https://cdn.shopify.com/s/files/1/0437/3689/1544/files/muvumufexilose.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/vafubefafujomok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9924/3174/files/jolikepapunanigeselusepov.pdf
    • https://cdn.shopify.com/s/files/1/0434/9450/6661/files/lafepibiwudeguxofarad.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5687/files/duparoxebiniv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6521/3089/files/63183715083.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_off0000702e.bin
0f826d4fabfe122745bf3fba7004376b1931913887d6e1e6d6bfd49e7651dbab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702E 5336 bytes
font_01_sfnt_off00008238.bin
2d35fe1b112251630f6c3e185fb4bf58c6327cea99f60afab3ca0473214b5b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8238 2116 bytes
font_02_sfnt_off00008c04.bin
2f48312f1bde3f078f26ee1db3c3fe844029953142c0ab9ffd722c77bd006a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C04 15132 bytes

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