Malicious PDF — malware analysis report

Static analysis result for SHA-256 b108b8654f755a9d…

MALICIOUS

PDF

40.9 KB Created: 2020-09-04 04:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8edf1fe5bd3b3823d0d085253acea558 SHA-1: cefde5878fa5a465bb0f246621786a65bc4f4554 SHA-256: b108b8654f755a9ddc71ecdc5ad6c8685b1f0b83f3c207a284eeaa51bedbfee0
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used in SEO poisoning or link farm attacks. One of these links, 'https://ttraff.me/wix?keyword=nationalities+worksheet+spanish', points to a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files hosted on static.usrfiles.com, suggesting a coordinated effort to distribute malicious content or phish users.

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.me/wix?keyword=nationalities+worksheet+spanish
    • https://static.usrfiles.com/ugd/b8c837_2e8a88e7e51e4582ac51e7d219dc9ab9.pdf
    • https://static.usrfiles.com/ugd/9d66c7_94fb2d607d774e57a10982c058ea1bb7.pdf
    • https://static.usrfiles.com/ugd/911c12_729a275fadf1467a81123cf29b420480.pdf
    • https://static.usrfiles.com/ugd/0f5b72_f688a788d317480691edafc5e1e6c205.pdf
    • https://cdn.shopify.com/s/files/1/0436/2049/9616/files/chicago_weather_report_for_today.pdf
    • https://cdn.shopify.com/s/files/1/0460/3576/3364/files/46226101813.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/cement_plant_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/5902/5822/files/84604151703.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7345/files/kanemomotutiput.pdf
    • https://cdn.shopify.com/s/files/1/0432/5054/8899/files/50524200541.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/21809857870.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/30356889611.pdf
    • https://cdn.shopify.com/s/files/1/0432/5471/0427/files/36053447153.pdf
    • https://cdn.shopify.com/s/files/1/0440/7263/2470/files/sakadubowegaliloro.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/jozozixopezixefomuzetowo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0219/2284/files/natux.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_off000061dc.bin
9aa989e7134ff9c1d6ebac7d84f79a56ee658aa6e64419e05f86521d7034d044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DC 5032 bytes
font_01_sfnt_off00007307.bin
0aa15473dc5c1fb94d5619b686748afad0321b60f3dac9329e2b026f7ce29198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7307 10412 bytes

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