Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18d1aeb62c8cc16…

MALICIOUS

PDF

43.7 KB Created: 2020-09-10 10:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a398a3c71613e2c035af9ac5a62c469e SHA-1: 2e7ec28550a167ae2b6e2ca8da8be6266bb76d0f SHA-256: f18d1aeb62c8cc163e1493480c65da5cd343a187c422f91b4c85e9fd3c10d6b5
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as malicious redirectors. The document body, though heavily obfuscated, contains text related to 'English comprehension worksheets year 4' and includes the primary malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=english+comprehension+worksheets+year+4
    • http://jezidekix.stmaryschurchbrighton.org.uk/uploads/1/3/1/4/131438641/wezaw.pdf
    • http://files.abfnspiritofhealing.com/uploads/1/3/0/8/130874485/mafamit_nokoj_womodejisufoxaw.pdf
    • http://setijak.theiceridge.com/uploads/1/3/1/0/131070867/a370fd80ea055d.pdf
    • http://files.hopespringsvenue.com/uploads/1/3/0/8/130813132/8bcd0cca92d1.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/report_traffic_accident_to_police_qld.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/48583156294.pdf
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/a_cradle_in_bethlehem_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/belukarufunus.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/70034683125.pdf
    • https://static.usrfiles.com/ugd/d5cf39_5ed2ce6825cc47cf888cc8ad8debf052.pdf
    • https://static.usrfiles.com/ugd/238140_5abe625a08c2407baf15f827b172115d.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/growth_of_islamic_banking_in_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0431/4939/4071/files/22445692069.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/anandam_video_songs_mp4.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_off00006b02.bin
16e43dac52d5259e7a7f67d47d65bad50abde0bda84a7603b92acf8a38a8c676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B02 5648 bytes
font_01_sfnt_off00007e38.bin
c1152193c43807eac65dc9804ebb4d71a03e8962b0d4778ae2afeac0a474d7c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E38 10864 bytes

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