Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee787bf8d4392ff…

MALICIOUS

PDF

45.5 KB Created: 2020-09-09 09:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e891b980c6dd3c96a3c46ed90bf56f4 SHA-1: 7575106f3649fa8a03fac96012c10f794c69a206 SHA-256: 4ee787bf8d4392ffb4c0f636fbdf0d0f0771c50d0ffef544dc9245c2d3f1a42d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF file was identified as malicious due to a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.club/pify?keyword=octopus+apk+first+version'. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, with 'https://static.usrfiles.com/ugd/0286dd_d0ee4f90eec34baba49731c38a72d73c.pdf' being the first identified. The document body contains garbled text but includes the suspicious URL and references to wkhtmltopdf, suggesting it was generated programmatically to host these links.

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.club/pify?keyword=octopus+apk+first+version
    • https://static.usrfiles.com/ugd/0286dd_d0ee4f90eec34baba49731c38a72d73c.pdf
    • https://static.usrfiles.com/ugd/f4de5e_a6083a9621294e91986f820aaf686d32.pdf
    • https://static.usrfiles.com/ugd/c8d394_0a89dc3703304c1ba49db7b5a4bceab4.pdf
    • https://cdn.shopify.com/s/files/1/0436/8911/5801/files/avatharam_malayalam_movie_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/7405/1493/files/33384199804.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7684/files/cancion_del_mariachi_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0438/0668/7389/files/xinomikidab.pdf
    • https://cdn.shopify.com/s/files/1/0448/9697/7051/files/franchising_nedir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/31858321402.pdf
    • https://cdn.shopify.com/s/files/1/0430/4112/8601/files/fdvv_fact_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/xusosu.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_off000075d6.bin
324718f4595c1862f9e2857d9c6c1fff2c0783eb7e4417c98c59104e2d09b31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D6 5128 bytes
font_01_sfnt_off00008763.bin
960326978f520e1a5098a5c85c676a4aa5b60640bbdd14070e58fde707e72e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8763 9872 bytes

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