Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf399554a39e78d…

MALICIOUS

PDF

35.1 KB Created: 2020-08-31 10:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b724911eef81e26a55c8354ef98be24e SHA-1: 8deb92e253511b283ddc7f17975d24db4936d074 SHA-256: bbf399554a39e78d13b76b1a1bf584a21579c60be711a365fe24ca217dc0e4ec
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL `https://ttraff.cc/wix?keyword=simple+past+reading+comprehension+on` is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and references to other PDFs, supporting the link farm detection. 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.cc/wix?keyword=simple+past+reading+comprehension+on
    • https://static.usrfiles.com/ugd/b8c837_d1f7a7240fc547119f6dc051bed9310f.pdf
    • https://static.usrfiles.com/ugd/6da380_6be4c65d4ea14138a49e8dd77b1472e8.pdf
    • https://static.usrfiles.com/ugd/18f527_976d14e1636c4b9c85c3d34a13899c7a.pdf
    • https://static.usrfiles.com/ugd/ef253e_68982263db9b4dd8aef2cdfe941301d9.pdf
    • https://static.usrfiles.com/ugd/d01287_24e8bb12ddf8465794f621cd64ae01a8.pdf
    • https://static.usrfiles.com/ugd/49be48_65a8e208630a46d78e6680ed111311f5.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/magical_spyglass_wow.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/alignment_chart_template_meme.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pedarivorenali.pdf
    • https://cdn.shopify.com/s/files/1/0428/1001/5910/files/making_dilutions_worksheet_answer.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/ruby_sea_aether_currents_quests.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/40730933953.pdf
    • https://cdn.shopify.com/s/files/1/0433/3921/9099/files/jegefab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4673/9866/files/jopojodoxasukukoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/castlewarden_golf_club_timesheet.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/
    • https://cdn.shopify.com/s/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c2a.bin
b8fb13a7f7bcf7b3c722981088394868bcb5096610089425f6c26574308b34ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2A 5592 bytes
font_01_sfnt_off00005eeb.bin
ea8b278d225d0bfc31460dbf321925725a7f38631700e1d31e1114d03e8c9a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEB 9408 bytes

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