Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c126f75eec55f5a…

MALICIOUS

PDF

35.1 KB Created: 2020-08-31 09:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb1e30ddd41926651ca4ef3c574fb56a SHA-1: 563c8732377b430627b3cf7e9114ae41a2e40111 SHA-256: 1c126f75eec55f5a3c82b6c6cfc30da876cfd982c4b9f77ff29e277c01292895
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body text, though partially corrupted, includes the phrase 'How to download doujinshi' and the malicious URL, suggesting a lure to a content-piracy site that redirects to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=how+to+download+doujinshi
    • https://cdn.shopify.com/s/files/1/0433/4351/1706/files/pantsu_detective_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/xorazunamed.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/77955728220.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/cascading_style_sheets_video_tutorial_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/cards_against_humanity_pride_pack.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/jonenasag.pdf
    • https://cdn.shopify.com/s/files/1/0451/1226/2821/files/foxupatipokabod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8821/6217/files/25025624230.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1542/files/73122881947.pdf
    • https://cdn.shopify.com/s/files/1/0459/9395/1399/files/cracked_normal_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/braveheart_theme_song_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/wyou_tv_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0429/5272/0543/files/vudifilosobezimoxudedisax.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5219/files/22235126894.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_off00004ce7.bin
a92fff673de7bfd7b0a382c1e077b0ac9d7ff7040ebc213ae476480d6d11b0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE7 4944 bytes
font_01_sfnt_off00005dbd.bin
4e6e8ce8c896ee11a66ae1d56bf31cb3fc33226ec8e6b0a8efda63b68a08c1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBD 10008 bytes

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