Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8be8c57bd2c2948…

MALICIOUS

PDF

43.5 KB Created: 2020-08-04 13:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5c85cd25a7f294a5a563ccec42f34a1 SHA-1: 0fc979c11a0f413ca54f10c1ecc628f1b17a16b7 SHA-256: b8be8c57bd2c29483c12f0485fa71370a1ad5633a41d1dd2f29b7c5865334978
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL identified is ttraff.com, which appears to be used for redirection. The document body contains garbled text but includes the target URL, suggesting a lure related to 'preparazione al celi 3 b2 livello intermedio pdf'.

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.com/pify?keyword=preparazione+al+celi+3+b2+livello+intermedio+pdf
    • http://files.thephillykitty.org/uploads/1/3/0/7/130739480/wukuxigu-dibovuxewoju-zogew-xodozujakizag.pdf
    • http://files.jbphotography.studio/uploads/1/3/0/7/130775633/9662753.pdf
    • http://files.experiencemoretolife.com/uploads/1/3/1/3/131381109/sofigigolu.pdf
    • http://files.onesquareworld.org/uploads/1/3/1/4/131453861/371a0e56ae26.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/bumajanokibifujazibazere.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/66256752603.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/check_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/getudokelesixasebipibuve.pdf
    • https://cdn.shopify.com/s/files/1/0437/3712/0933/files/54314857303.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9204741539.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16485275060.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/22114827178.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/12030087209.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/john_deere_rx75_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1679/7857/files/23832225905.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/7320457776.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1911/files/viwupowubuxatesolobepa.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_off00005188.bin
6de53a51d583a4478fc8b9ed891494e7f521966ab70ef7618cbb340be6ceb381
pdf-font-stream PDF embedded font (sfnt) at offset 0x5188 5668 bytes
font_01_sfnt_off000064c5.bin
5344176b11aac56d0fa152a63bb3b65f0905d51df231d37f025e6c305f915bc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C5 19252 bytes