Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5661ccf8dd78993…

MALICIOUS

PDF

55.6 KB Created: 2020-09-02 04:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0141061bd5647e08f0eeab7ac276e27b SHA-1: a4df4e2c6966a42382e63153b6f509834c04c00e SHA-256: a5661ccf8dd78993d451945a78db7a1d4c0cd039caf5703aa0a1665d9149b8bf
150 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking title, reinforcing the lure.

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=ba+1st+year+book++sociology
    • https://cdn.shopify.com/s/files/1/0433/5520/9879/files/calendario_serie_a_18_19_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9992/files/busaf.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/34258317491.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5084/files/leramajepo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/1407557078.pdf
    • https://static.usrfiles.com/ugd/47b1e8_00fbeb762769477f9f18132802ce6674.pdf
    • https://static.usrfiles.com/ugd/b8c837_1aa0283f45e24b3c9990fc3d1ef8b32f.pdf
    • https://cdn.shopify.com/s/files/1/0438/8916/4440/files/18899418862.pdf
    • https://cdn.shopify.com/s/files/1/0464/6918/5686/files/canarios_gaspar_sanz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/zosafi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5522/files/rozataxafofonaxitipepokuw.pdf
    • https://cdn.shopify.com/s/files/1/0448/1161/6418/files/procedimento_cautelare_uniforme.pdf
    • https://static.usrfiles.com/ugd/cc14e4_a5102526ce1c4562a2fc556985af5238.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_62054e3c915648ad95b9031878fe9e4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d01c966a0c143d886debc6ec7c5fe9d.pdf
    • https://static.usrfiles.com/ugd/296484_edf970e1af564ffa933de394dbe6df84.pdf
    • https://static.usrfiles.com/ugd/e1d12c_6633b9a79d6c4be092a1670401215670.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ed0.bin
970db98d9375a2dd9591e82fc62bbace116da648b39a3aefd4d302713c3bdbee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED0 5376 bytes
font_01_sfnt_off00008139.bin
82c047ac093810968bc043e1395e19a776fddf61b5ae473d26a3e46c73460b1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8139 2596 bytes
font_02_sfnt_off00008cbc.bin
5e067315a2bd9524b6254977960f062bb129990ed69868068e29b4596197f3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBC 2320 bytes
font_03_sfnt_off0000970f.bin
398ca803b695a57b9c765d37f0f61a8b843351ab9fdef8246b5504a633d96ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x970F 10440 bytes
font_04_sfnt_off0000baaf.bin
a349519ccbdbca3d75704c2becf615ab37801eb1543272228454131dceb83acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 16224 bytes

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