Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83089b9f6c65d6e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-25 02:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcc776876a14a9bc0764ac09058b3868 SHA-1: 5a5b8fce40fe5f778619d039175cf0db7c01f02f SHA-256: b83089b9f6c65d6e6b8e3654e14cb6175a573a8c596da391eb8fe62b4fe786fe
150 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing indicating a malicious redirector at 'https://ttraff.ru/pify?keyword=boxing+training+at+home+video'. Another critical heuristic identified a PDF link farm, with the primary link pointing to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same redirector URL and a link to a Shopify PDF, suggesting a lure to a malicious 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.ru/pify?keyword=boxing+training+at+home+video
    • http://files.catholiccharismatic.com/uploads/1/3/2/7/132712120/taxogepokoj_kapuka_kizomibifoka_tagamofulebalos.pdf
    • https://cdn.shopify.com/s/files/1/0438/6023/0294/files/princess_diaries_10.pdf
    • https://cdn.shopify.com/s/files/1/0437/7732/7265/files/vetutifoxavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/64895502180.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8241/files/arabic_keyboard_download.pdf
    • https://cdn.shopify.com/s/files/1/0446/0979/8307/files/58121571926.pdf
    • https://cdn.shopify.com/s/files/1/0430/0950/7487/files/36727440728.pdf
    • https://cdn.shopify.com/s/files/1/0428/2020/6758/files/jisosumumubazegine.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5265/files/24110463144.pdf
    • https://cdn.shopify.com/s/files/1/0437/3377/8597/files/manually_calibrate_hp_battery.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/69405581022.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85484739365.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_off0000678d.bin
bbc92835aab0702f290971e465866341c2cbdf06702bb2a789e084c5a00413b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678D 5208 bytes
font_01_sfnt_off00007918.bin
2cb55cd331bfc17545746632c09b52c43c4c61b8e4fa47a2a244f9b085651360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7918 10468 bytes

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