Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1d7ea5b7a82edc…

MALICIOUS

PDF

38.9 KB Created: 2020-08-01 06:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ef4043fbbf5c6af5233f09a4104bbe2 SHA-1: c817ef876880b7b6f3ba1f64e1253d61d53aae43 SHA-256: 4d1d7ea5b7a82edc0072953a8049eb68760c22f460c9d2b0a9e78a43b6b1432c
120 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'cmas practice test' and the malicious URL. This suggests a phishing or scam attempt to redirect users to malicious infrastructure.

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.ru/pify?keyword=cmas+practice+test
    • http://files.caralehmann.com/uploads/1/3/0/7/130739621/laxovinotu-vavotudenu.pdf
    • http://files.microtripod.com/uploads/1/3/2/7/132741375/gopezukakuzika.pdf
    • http://files.sustainmizzou.org/uploads/1/3/2/6/132681359/xuzedamekuduvu.pdf
    • http://files.acceptancegroup.com/uploads/1/3/1/8/131857465/4757746.pdf
    • http://files.sarahbakpottery.com/uploads/1/3/2/6/132696029/piwugum.pdf
    • https://cdn.shopify.com/s/files/1/0429/3735/2358/files/xizejugoritagejojima.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/japugaxed.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/5000/files/juvevavexitunekelemuxale.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/36224167283.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/wetetofizuviruporabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/xurisasofosemopexirob.pdf
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/auto_cadd_2007.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/2321010807.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/99088121717.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/regokudupixuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/67508169250.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_off00005bda.bin
c0a75e275e48dcd0454549c36896469ba2904dfe12c6d002cc0d3d28612c51f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDA 4952 bytes
font_01_sfnt_off00006c91.bin
5e78ff816408e0d45304bd4eb798df93ebff85a316f469372b1388ca62efcd7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C91 10064 bytes

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