Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b839edcf77e1ecd…

MALICIOUS

PDF

48.1 KB Created: 2020-08-30 06:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1060a3727dba1e6179d4d28929d25cc SHA-1: bb5737d38bd1630c686570a67e9ea508fa158e1f SHA-256: 2b839edcf77e1ecd8f0bc416d224b5dace1a88aa9a0bd10e4ffd1819d17a22cb
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.cc, disguised as a certificate. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The presence of a visual download button further supports a social engineering lure. The primary attack vector appears to be redirecting the user to malicious content via the embedded link.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=certificate+for+school+project+class+12+bst
    • https://static.usrfiles.com/ugd/837d34_5ccedf20420a4e7c84b18c4090e7a137.pdf
    • https://static.usrfiles.com/ugd/b8c837_93ba3da61f764956aa760ba5357b868c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b05c253910c4433b5a6a32592893e7e.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/35893075798.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/lux_build_proguides.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/dafakexez.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/defunoxerumuxosu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2046/files/best_waste_management_system_in_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0463/6842/4091/files/formal_email_writing_topics_for_class_8.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/broadcast_news_and_writing_stylebook_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/differences_between_sociology_and_anthropology.pdf
    • https://cdn.shopify.com/s/files/1/0429/8961/7311/files/33092496874.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/root_checker_apk_free_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/pajejamugiwo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006686.bin
3790ed6b23501b146daed71e5539092ed661f2a4d27a07f0f80db576eb5d2107
pdf-font-stream PDF embedded font (sfnt) at offset 0x6686 5208 bytes
font_01_sfnt_off00007853.bin
31fbfc9bbc6de0b75801ce29916000a79923550f45eb8d83ddc604555cb3f458
pdf-font-stream PDF embedded font (sfnt) at offset 0x7853 14176 bytes
font_02_sfnt_off0000a538.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA538 4324 bytes