Malicious PDF — malware analysis report

Static analysis result for SHA-256 41622a3a0da1bb29…

MALICIOUS

PDF

47.7 KB Created: 2020-09-05 06:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01e2887ae8c151ad564455f3fb3967e0 SHA-1: 230b21d0e510238e0bf400e2bc4f536ade478382 SHA-256: 41622a3a0da1bb2978c87fd888bd8519714447f9a37acf0040e4e98dbd871f2f
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.club', which is indicative of a phishing or malware distribution lure. The document body, though heavily obfuscated, contains the same redirector URL and a list of other PDF links, suggesting a link farm designed to obscure the malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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=family+tree+template+editable+free
    • https://static.usrfiles.com/ugd/e8506d_7773b757291e453c842ae2dc820ebcc7.pdf
    • https://static.usrfiles.com/ugd/850f07_27b8ed62de4f42e3869a0805848d770d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2968bec767fc414990ff7115e05a105f.pdf
    • https://static.usrfiles.com/ugd/9ea91e_81534ba55f5c47bbbbe26cea260a845c.pdf
    • https://static.usrfiles.com/ugd/33ab24_59226fc48c554082bf5ea902f9b86e93.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/vakuxal.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/44334066348.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/36590264981.pdf
    • https://cdn.shopify.com/s/files/1/0461/4068/6489/files/agnes_stewart_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0432/5641/4363/files/worksheets_of_present_indefinite_tense.pdf
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/noxobonobeki.pdf
    • https://cdn.shopify.com/s/files/1/0429/4616/6943/files/sefazemud.pdf
    • https://static.usrfiles.com/ugd/8c2e83_54b6d147959f45caa5583798500dda84.pdf
    • https://static.usrfiles.com/ugd/b8c837_cda37eaa1d2243e7ad204dc883723ec4.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_off00007c25.bin
9a3a9a679424d9e706f4960b9c2a535daa818f664d4ac9309e1d941574880cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C25 5204 bytes
font_01_sfnt_off00008dc8.bin
d71798c49dda947dd6c9403208a0735b0cf45147609623bff2f7710337ffe1d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC8 10588 bytes

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