Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abf2314e2b22dd1…

MALICIOUS

PDF

45.8 KB Created: 2020-07-17 21:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3ff61d1f173b7a382370a48f9482df6 SHA-1: d1834c044d8a96d4386ef895be10fc314f2ae34c SHA-256: 8abf2314e2b22dd1773943fdfde3e3200d4ce135d8f213a5f503dcabad6c758a
150 Risk Score

Malware Insights

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

The PDF contains a lure for a free textbook download, which is a common social engineering tactic. It embeds multiple links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The ML classifier also strongly indicates maliciousness. The primary attack vector appears to be directing users to malicious content via a deceptive link.

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/wb?keyword=free%20download%20nelson%20textbook%20of%20pediatrics%2020th%20edition%20pdf
    • http://files.treekangaroos.com/uploads/1/3/1/4/131483778/xoxel.pdf
    • http://files.elixirespressobar.com/uploads/1/3/0/8/130814205/9948b1ab73ae.pdf
    • http://files.3dpormexico.org/uploads/1/3/1/8/131871852/b3656ea8fff48.pdf
    • http://files.daventrydogtrainingclub.com/uploads/1/3/0/8/130873973/6745225.pdf
    • http://files.3dpormex
    • https://cdn.shopify.com/s/files/1/0430/2602/2554/files/xafajam.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/nadagofov.pdf
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/navaradon.pdf
    • https://cdn.shopify.com/s/files/1/0435/1338/1028/files/nifokepopagosugede.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/zolomuzuvori.pdf
    • https://merefipo.files.wordpress.com/2020/06/94525058393.pdf
    • https://jonaluzoj.files.wordpress.com/2020/07/gelafulizomixekalemawo.pdf
    • https://fizedetaz.files.wordpress.com/2020/06/20250201529.pdf
    • https://mijukuwojaw.files.wordpress.com/2020/06/xowagoroginowerupatepesa.pdf
    • https://wupefosa.files.wordpress.com/2020/06/lebanaputapewamewabukizib.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/18759581487.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/pukejasozubasavezinerad.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4981/files/65275394042.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/wuforofabagijisexogija.pdf
    • https://cdn.shopify.com/s/files/1/0434/9542/4165/files/vovebojaxisitokiwediki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/safuginogatujato.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.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_off00007262.bin
4899399a755314316f375de8bb7bdfb88991d79927486f6cfe5c2b3d66311dab
pdf-font-stream PDF embedded font (sfnt) at offset 0x7262 5624 bytes
font_01_sfnt_off0000858e.bin
24470a34ad0b81fec29512d5a6947e6a9e5e350d19463b534edca0ab3367d144
pdf-font-stream PDF embedded font (sfnt) at offset 0x858E 10800 bytes