Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bc80ae4c1850eb…

MALICIOUS

PDF

40.7 KB Created: 2020-08-21 00:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9ee0644b455ba0a2cdad13f6978ce32 SHA-1: a37e2409817a406bd450ecba8f2c352fa68a6d5f SHA-256: d4bc80ae4c1850eb10e889b4a6f41ce9ec371446e25bc8344ea4e0ebf31dd814
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL and appears to be a lure for educational materials. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack. The file is likely designed to redirect users to malicious infrastructure.

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.
  • 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
  • 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.ru/pify?keyword=free+printable+division+worksheets+grade+3
    • http://barura.victoriayoga.co.uk/uploads/1/3/1/8/131871390/3674860.pdf
    • http://files.mrsararadian.com/uploads/1/3/1/4/131453676/725d0ad5d8b20d.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/62354850749.pdf
    • https://cdn.shopify.com/s/files/1/0454/7058/0902/files/34064226387.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6238/files/47959759865.pdf
    • https://cdn.shopify.com/s/files/1/0434/6563/8048/files/65065426342.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/high_school_english_grammar_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/nitesuxijunajafin.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4642/files/fetogugobezul.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/tamuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5382/5704/files/4969124580.pdf
    • https://cdn.shopify.com/s/files/1/0429/4970/5881/files/toripejemivaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4024/2840/files/tupatani.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_off00005b97.bin
5bc09fa37e47af0c9980191ed80d61f0fa856095085cecd15d54bd5a17bd7a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B97 5696 bytes
font_01_sfnt_off00006efb.bin
2a1f57a783b43c9b97eb3f9d69a05af913b635ed40a4dc441f19b4610a614fa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFB 11604 bytes

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