Malicious PDF — malware analysis report

Static analysis result for SHA-256 429c535d649a53d1…

MALICIOUS

PDF

36.0 KB Created: 2020-08-09 16:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 822bad81cbff0a18fd77106f1fb339fd SHA-1: c61731bfbe261b3bdebc63d22d1b926d41b7ba59 SHA-256: 429c535d649a53d17539a308dc1e71bd15a8cd4a75896f140ded9521a8c64122
120 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body text, though heavily obfuscated, contains the string 'https://ttraff.cc/pify?keyword=academy+stars+1+workbook+pdf', indicating a lure to download a PDF disguised as an academic workbook. The presence of numerous PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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/pify?keyword=academy+stars+1+workbook+pdf
    • http://files.worldbaseballalliance.org/uploads/1/3/0/7/130776498/mamaxiraveka-koxuk.pdf
    • http://pututakiv.szienz.com/uploads/1/3/1/4/131437657/lebipafom-buzareja-niwova-mupusewenomu.pdf
    • http://files.ccag.net/uploads/1/3/0/7/130739525/xuwopekewuwanu.pdf
    • http://tonije.mombabymelts.com/uploads/1/3/2/6/132681352/d1a8d516c2.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/surah_yasin_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3983/4780/files/tapadusaligolevetoke.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/lowavakonuvaridibaginog.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/bukalawikasulofuvesof.pdf
    • https://cdn.shopify.com/s/files/1/0439/8225/8334/files/bi_rads_fifth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/4413/4294/files/stone_age_bronze_age_iron_age.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5512/files/42007807341.pdf
    • https://cdn.shopify.com/s/files/1/0437/6707/0877/files/inspiring_thoughts_a._p._j._abdul_kalam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5299/8556/files/50017429278.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0213/files/python_read_tsv.pdf
    • https://cdn.shopify.com/s/files/1/0428/8200/7199/files/17158226568.pdf
    • https://cdn.shopify.com/s/files/1/0431/1325/0965/files/49205543934.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/gipemetuwovomazanakasug.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_off00004e9a.bin
ad347ebbae3f1fd6e593be34357a5ccf34b2f8bf0899bd2ead9026c43d9f8ec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9A 5708 bytes
font_01_sfnt_off00006212.bin
644a4209cc704d1cb4a4dde02fa3e7847b2474b079dc04040ef42b0c72bd2da3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6212 9704 bytes