Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c6c3df2466aa06…

MALICIOUS

PDF

44.1 KB Created: 2020-08-16 01:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7695a1d06853189d8d8e67634a2a0d5c SHA-1: 69ad7716d6bf577924841f03101030eed087b212 SHA-256: b4c6c3df2466aa06a0f7063d0379cd53448c771c0a6e2da5c441832bf57a9ce2
128 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to appear as a free download for educational materials, but it redirects to known malicious infrastructure. The primary malicious URL is https://ttraff.cc/wb?keyword=olympiad%20books%20for%20class%2010%20pdf%20free%20download. The document body itself is heavily obfuscated but contains references to the malicious URL and numerous benign-looking PDF links hosted on Shopify, likely to improve search engine ranking and mask malicious intent.

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/wb?keyword=olympiad%20books%20for%20class%2010%20pdf%20free%20download
    • http://files.sorrowfulmother.net/uploads/1/3/0/8/130814258/lalek_filolaxesidepeb_razefenelofe_wotaguvod.pdf
    • http://pakariti.mattiasgraves.com/uploads/1/3/0/8/130814106/88a20d.pdf
    • http://domeno.lincolnleapers.com/uploads/1/3/0/7/130775734/xosudifud.pdf
    • http://files.mystreetstamp.com/uploads/1/3/1/3/131379567/jegodadafutasaza.pdf
    • http://files.dcchurchofchrist.org/uploads/1/3/1/1/131164446/1ec552f4181.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/tovidorilos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0342/0570/files/temimatek.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/66050584409.pdf
    • https://cdn.shopify.com/s/files/1/0438/3893/1109/files/renemoreboga.pdf
    • https://cdn.shopify.com/s/files/1/0428/1021/2519/files/guferanozokenavak.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/57995481602.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3032/files/41008973285.pdf
    • https://cdn.shopify.com/s/files/1/0447/8281/3341/files/cs_lewis_cristianismo_puro_e_simples.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/rilamojef.pdf
    • https://cdn.shopify.com/s/files/1/0438/0252/5856/files/4562364199.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20807514836.pdf
    • https://cdn.shopify.com/s/files/1/0430/3156/0354/files/21880763387.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_off00006c5e.bin
398f4494a1ace70003449211dc1fc445a18b2890af1499e83d00251abcd598bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5E 5920 bytes
font_01_sfnt_off00008080.bin
06b44a4633ae32c998e6f16d82c9ff38037a44dff7d0196b55533bdc6466de5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8080 10188 bytes