Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01b85746633bf0a…

MALICIOUS

PDF

41.7 KB Created: 2020-09-01 19:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e14730b59689fb7876759181ffa8a4f SHA-1: ca4ec845f83963771d0b5b834449736377ab8214 SHA-256: c01b85746633bf0a6bc678375e6ebe8c96a43d307ce5b740f5d7bcfb5c72ec8d
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to drive traffic to a malicious site. The document body, though heavily obfuscated, contains text related to 'free worksheets on verbs for first grade' and the malicious redirector URL, suggesting a lure to trick users into clicking the link. 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.cc/pify?keyword=free+worksheets+on+verbs+for+first+grade
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/tediwipisuwapa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7378/8321/files/suneladepipamevitidag.pdf
    • https://cdn.shopify.com/s/files/1/0433/3305/8710/files/3017024117.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87678197609.pdf
    • https://cdn.shopify.com/s/files/1/0461/8810/1785/files/youcam_3_full_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1863/9771/files/karupolenasevupakure.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/discord_audio_not_working.pdf
    • https://static.usrfiles.com/ugd/bca722_ade0adc654e143acbcec027a608a3e63.pdf
    • https://static.usrfiles.com/ugd/9e41f0_92396deb277645f79f66b5349c601a4b.pdf
    • https://static.usrfiles.com/ugd/37321e_769439d99d6b4fb9a02820faa7ccc8a4.pdf
    • https://static.usrfiles.com/ugd/286fb8_e61a02cb69d94609b2bd4ced8c837fb9.pdf
    • https://static.usrfiles.com/ugd/ca300b_556ab96c1fb94aea80306d1e5d874b80.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9843/9837/files/5243980064.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/everstart_jump_starter_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/wowebagetagen.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugufu.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_off0000641d.bin
e573fec51e4f80d3d7fcb9b197c74dcb3ae9093fbf5adcd75f4d9b4b68172c71
pdf-font-stream PDF embedded font (sfnt) at offset 0x641D 5448 bytes
font_01_sfnt_off000076bb.bin
e74aff8977753827e3952be033c1b05fe13217acde13b2fea319957e31ad6fd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x76BB 10120 bytes