Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4194d6dbe73091…

MALICIOUS

PDF

40.5 KB Created: 2020-08-25 05:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad15566082aeac56a9744795bfbaaf7d SHA-1: 68463f3141d8b1eadf92bce089656ebb80217065 SHA-256: 8b4194d6dbe7309142a7b29609d3046a6871d6dc636c56f1f0bfc73ae195bb6d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=adjectives+exercises+for+class+3+with+answers'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on various domains, suggesting a link farm or redirection strategy. The presence of a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag strongly indicate malicious intent, likely to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=adjectives+exercises+for+class+3+with+answers
    • http://jatijide.saydellittleleague.com/uploads/1/3/1/1/131164312/muverefelisuboronap.pdf
    • http://files.wleeaa.com/uploads/1/3/0/8/130874413/likedukivegewoj.pdf
    • http://files.roxaniart.com/uploads/1/3/2/7/132740665/butusiraz.pdf
    • http://fosow.chavianosmind.com/uploads/1/3/1/4/131406947/sawekeradu-jipag-sezepoxofux.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/xabikitirogopomuxuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4887/7736/files/52161642913.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/64934754734.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4801/files/prosedur_amdal.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4292/files/rasavikeselututusolosofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/6371/2671/files/corpse_bride_theme_song_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/wesakek.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9374/files/59100031382.pdf
    • https://cdn.shopify.com/s/files/1/0434/9673/4880/files/26778154479.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f9c.bin
74cd288391841ed55cc907a43afe32663bddd4a8236fb274fe26a343e0549ebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9C 5556 bytes
font_01_sfnt_off00007292.bin
e462fd2b0f4f186a46010fc62e8228279ff2501c91d762d5ba4066cf9942e929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7292 10156 bytes

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