Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed0a4dd68a354d9…

MALICIOUS

PDF

44.8 KB Created: 2020-08-19 06:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4f9b78001f40cece431a1c5df06d2ab SHA-1: 13e902a53f91c983bb4bcdaea3eff8a9bec335f2 SHA-256: 3ed0a4dd68a354d94e5cb24b91960e9766a06f425dd668563361fc78a44742c9
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as an Ofsted report, which is designed to lure users to a malicious URL. The PDF also contains a large number of external links, many hosted on Shopify, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier 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.cc/pify?keyword=beechen+cliff+ofsted+report+2018
    • http://files.oakgrovechristianschool.com/uploads/1/3/2/7/132740270/7703140.pdf
    • http://rerixom.fennoyrittajat.fi/uploads/1/3/1/8/131856772/9295451edb250.pdf
    • https://cdn.shopify.com/s/files/1/0431/4015/3505/files/dakegapulob.pdf
    • https://cdn.shopify.com/s/files/1/0434/0134/7226/files/13893387782.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/pineapplebrat_workout_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7688/files/2019_editable_monthly_calendar_templates.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/analysis_and_design_of_flight_vehicle_structures_bruhn_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/72846798481.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5510/files/sound_booster_app_for_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/5385/8472/files/juboxokubezefereguk.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/riluxoderaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2033/files/gasurumuzigiribode.pdf
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/42368996168.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_off0000705a.bin
cc11c67568b7d4cc36e34c110ff361ab8766f0a75267934f402c182070bd3311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x705A 5604 bytes
font_01_sfnt_off00008361.bin
9a0fac72ce9c4d9ea4bb379f0dbcbcf4544e0d42bbe399405cd3a505a370ea4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8361 10304 bytes

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