Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce78b92afa7dcb96…

MALICIOUS

PDF

43.6 KB Created: 2020-08-02 03:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fef7d9ad9b300fd3090d98f315f2ae8 SHA-1: 7cc2f25261e07ef071efc88fb1a1ff29e69db2e3 SHA-256: ce78b92afa7dcb96a65cb7d884c2d80870995fecfbf0f1fe1ca65d28d61206df
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for a malicious redirector link. It also contains a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm or redirection strategy. The primary malicious URL identified is https://ttraff.cc/pify?keyword=tensorflow+mnist+github, which is likely used to redirect users to a malicious site. The document body contains obfuscated text and the identified URLs, reinforcing the malicious intent.

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/pify?keyword=tensorflow+mnist+github
    • http://files.enviromarc.com/uploads/1/3/0/7/130775762/4022916.pdf
    • http://files.clevelandcountymastergardeners.org/uploads/1/3/0/7/130775032/zewonefirix.pdf
    • http://files.david-heath.info/uploads/1/3/0/7/130776103/diretaxet.pdf
    • http://files.walthamchangemaker.org/uploads/1/3/0/7/130776158/linefivutap_bebajat_piwewipovemu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/82840858467.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/90113074216.pdf
    • https://cdn.shopify.com/s/files/1/0431/0240/4769/files/12236650360.pdf
    • https://cdn.shopify.com/s/files/1/0434/2428/4824/files/bajop.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3253/files/star_trek_ringtone_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/0105/2321/files/85224989502.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/tofudisu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9562/9725/files/92183283568.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/tipepo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/mutokofofijefivijamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duzawubemamomavokam.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/mirodawezonagekemi.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_off00006d73.bin
da6202f1fe71dc6a934d8ee8c3ce5fd3e047d1315fb24d069fd28c0ee8f7cf57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D73 5152 bytes
font_01_sfnt_off00007ee4.bin
1569dd1cd561ee701d91ee9e844d59584467020c62030488355ecb74825998e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE4 10116 bytes

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