Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c9ac049f0285f1…

MALICIOUS

PDF

42.5 KB Created: 2020-08-10 03:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 035c1a260e88271f27c636b301ccfb55 SHA-1: 1988fae24e799092455eb8372d604cc2343229e8 SHA-256: c7c9ac049f0285f1f556fb3aae726bfe364eceaca12f852fe57f07318e096c44
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to 'ttraff.ru', disguised as free book downloads. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on the malicious redirector URL, likely leading to further compromise.

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.ru/pify?keyword=anatomy+and+physiology+book+pdf+openstax
    • http://files.flutefest.org/uploads/1/3/0/7/130739444/367cd159ec.pdf
    • http://kizufuvot.laura-walters.com/uploads/1/3/1/6/131606490/lokulinuveguw.pdf
    • http://files.aitosaudio.com/uploads/1/3/2/6/132681901/nisajewosoxalal.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/nobat.pdf
    • https://cdn.shopify.com/s/files/1/0434/9915/9718/files/25452438988.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/soxaroxapafumodekif.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6961/files/pazuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/github_clone_ssh.pdf
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/lidujofodabogonibikodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6555/7671/files/wuwilavafutasijow.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/rimurenibopuxufulape.pdf
    • https://cdn.shopify.com/s/files/1/0431/8507/8434/files/oxford_discover_1_student_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/dictionary_english_to_urdu_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/55794575989.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_off0000642c.bin
d3a4d97319aac5f24426c5f2ec2bd01c0745c8818aa24bfdb3c5f6edccec9092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x642C 5720 bytes
font_01_sfnt_off00007792.bin
86c4afb61fa6bd20fa013983d0502c23fe5f70ba126e447f68b67e73f9e7d2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7792 10488 bytes

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