Malicious PDF — malware analysis report

Static analysis result for SHA-256 389bd1733cfc4576…

MALICIOUS

PDF

42.7 KB Created: 2020-08-13 23:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b9224cc3e22a2ce7d363b6d6cab2e32 SHA-1: a79a012f9a0bdf01d429f50db9d4bd84c792e723 SHA-256: 389bd1733cfc4576c6d4745f1f3e93161103e116882656844a267091616f7140
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=vernier+caliper+notes+pdf'. The document body itself is heavily obfuscated but contains this URL and other links, suggesting a lure to external content. The primary attack pattern is likely a phishing or scam attempt leveraging a link farm to distribute malicious content.

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=vernier+caliper+notes+pdf
    • http://files.cristinavannel.com/uploads/1/3/0/7/130739520/puwabusibagofizu.pdf
    • http://zofulu.kwjclassiccargifts.com/uploads/1/3/1/3/131381489/savig_mefinu.pdf
    • http://files.illuminatedobjects.com/uploads/1/3/2/6/132681452/6032176.pdf
    • http://files.rejectrobotics.com/uploads/1/3/1/3/131398334/megezudemoledaja.pdf
    • https://cdn.shopify.com/s/files/1/0432/4111/1716/files/45573196725.pdf
    • https://cdn.shopify.com/s/files/1/0433/9154/9590/files/organic_compound_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5519/files/pdf_to_word_macbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/cbse_maths_book_class_8_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/zajasesoxudir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6628/5462/files/sirejimatonavatov.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/26910215058.pdf
    • https://cdn.shopify.com/s/files/1/0431/9998/7873/files/laneserividoverop.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/73688633938.pdf
    • https://cdn.shopify.com/s/files/1/0437/8745/2576/files/arrival_of_the_birds_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0440/1430/5430/files/posuseribeviwumuwegurew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/xatoxatidikazibagif.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_off000069c8.bin
b900f8d2169319c8ad6e1eb01ca37503abf85ee82175489d2ca5ca70a67061b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69C8 5116 bytes
font_01_sfnt_off00007b31.bin
9fdaa1f003df43620d6bce2d670c1810150e5fe0521bff21f83ce851fd79afc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B31 10160 bytes

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