Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b6abfaeaf2385d…

MALICIOUS

PDF

39.1 KB Created: 2020-08-31 06:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6cb0651b58c4f7eddb9e1be262bf882 SHA-1: c9ececa1e170f5bc42cd1d0098a48d61d1cab14a SHA-256: c8b6abfaeaf2385d61d95fda808732268addc58e2d7940a8a78a73a886f885b3
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.cc). This indicates a link farm strategy, likely intended to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was largely unreadable binary data, but the presence of the malicious redirector URL is a high-confidence indicator of malicious intent.

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=istatistik+olas%25C4%25B1l%25C4%25B1k+sorular%25C4%25B1
    • https://static.usrfiles.com/ugd/a4e402_5d42bc0fd50646baabad3047a1a65f8b.pdf
    • https://static.usrfiles.com/ugd/739437_ce7807f3af524c3e85dd971e3de119d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7167622828f74a75b01f80f02a8e7c95.pdf
    • https://static.usrfiles.com/ugd/529dbf_ec8ed3bcad534a9caaf774a57b38a6c0.pdf
    • https://cdn.shopify.com/s/files/1/0428/6047/8630/files/electron_configuration_worksheet_answer_key_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0433/5491/4981/files/morfologi_aspergillus_sp.pdf
    • https://cdn.shopify.com/s/files/1/0435/9120/5021/files/32602779770.pdf
    • https://cdn.shopify.com/s/files/1/0436/9468/6376/files/18704953922.pdf
    • https://cdn.shopify.com/s/files/1/0440/6788/1125/files/98709506132.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9507/files/nofugofezumere.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4833/files/great_anime_movies.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/gilofiniligigozetufudepeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/momofada.pdf
    • https://cdn.shopify.com/s/files/1/0436/9448/9755/files/49687450652.pdf
    • https://cdn.shopify.com/s/files/1/0434/3824/3996/files/algorithmic_programming_ravi_ranjan.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/birds_full_hd_wallpaper_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/9299/1399/files/kevakawidituzinofod.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_off0000599b.bin
69c383280024bfce2bde0708bd7e4e5f204022e1789a24cd2c6901bc6879fd9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x599B 4712 bytes
font_01_sfnt_off000069a5.bin
290408d9e4f2fe32b40501fb687d48c397f5130b71c78fd88570457e232ee346
pdf-font-stream PDF embedded font (sfnt) at offset 0x69A5 11652 bytes