Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ea8b0b1bc453a9…

MALICIOUS

PDF

41.5 KB Created: 2020-09-10 20:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00522fa56ff28213e792b9fca053e05f SHA-1: 36e823614eac2dcb01500bec1f0e2358099a0ef4 SHA-256: 92ea8b0b1bc453a9ba634def79cbeb1fe332869dc1d9b6fbf3571829dd5105ef
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a high number of external links, many pointing to a redirector. The document body, though heavily corrupted, contains a URL that appears to be part of a link farm. The primary malicious indicator is the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, which identifies links to known malicious redirector infrastructure.

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/pify?keyword=princess+coloring+sheets+to+print
    • https://static.usrfiles.com/ugd/8d57bd_44f2561ff7c84076a17ec4635c40338a.pdf
    • https://static.usrfiles.com/ugd/4c3ae3_97cebdac50824e12bc04a416706f0bc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b344450f25b49bf95e1d2fa05b85f01.pdf
    • https://static.usrfiles.com/ugd/0adedf_0484ab4091504f1a94a7b7cdcd60cde6.pdf
    • https://static.usrfiles.com/ugd/90423f_06435095df914334945e0f80527540a2.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/mozejisifepufuzuxapat.pdf
    • https://static.usrfiles.com/ugd/b8c837_b95716b858614aa88eb1b35794524522.pdf
    • https://static.usrfiles.com/ugd/a91264_e568e075013f474ea914d365cb27fe5b.pdf
    • https://static.usrfiles.com/ugd/a1fb72_037324bab14b4138a414bc56269dbd16.pdf
    • https://static.usrfiles.com/ugd/a58502_0d7c960cec624883b4b3993fd91d0b7b.pdf
    • https://static.usrfiles.com/ugd/ede58b_799e1d3200c34bc89c4dbd865c903ed7.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/ledibubutuzawanigej.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/88288487884.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/sway_with_me_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/3031/5159/files/xuxalurugubejuvapipumed.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_off00006687.bin
62fcf65b88f70fe9a81865923f89675d44ee0f02e457b4bfa401e0d20b9874c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6687 4984 bytes
font_01_sfnt_off00007778.bin
33b0d52ae7d8c6b135e7301497ff9fcd20f64866f9be94c55f64156655ef4366		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7778 9852 bytes

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