Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8bd31d9a45d35d…

MALICIOUS

PDF

45.1 KB Created: 2020-08-10 17:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 669f5024567d14bb4c2415a183e1e32c SHA-1: 726462778781d9d839f790a0e1093a42ab37a034 SHA-256: ac8bd31d9a45d35dc3ae3da910957eaf00115a2c84f68cdff3e9a41197022479
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=reading+for+gist+exercises+pdf', is designed to redirect users to potentially harmful content. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a strong indicator of a phishing or social engineering attack.

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=reading+for+gist+exercises+pdf
    • http://files.taiwan-america.org/uploads/1/3/1/4/131454466/862401.pdf
    • http://files.emmanuelcrespoartworks.com/uploads/1/3/1/4/131453024/newikun_xonipaxop_gejefepimawadu_fibef.pdf
    • http://files.thebotanicalbrownie.com/uploads/1/3/0/7/130739678/3273927.pdf
    • http://dikibeve.bayviewmedical.com/uploads/1/3/0/7/130776031/wuwununisupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/87218489971.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3397/files/something_anything_someone_anyone_somewhere_anywhere_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/2164/6498/files/the_last_stand_union_city_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3413/files/diagnostic_imaging_gynecology_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/49484308160.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/61522111635.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/balifuvupopevijakokoji.pdf
    • https://cdn.shopify.com/s/files/1/0435/1308/6106/files/zeralovomifeto.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1609/files/38197014242.pdf
    • https://cdn.shopify.com/s/files/1/0429/2401/5783/files/39078405747.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/36059277053.pdf
    • https://cdn.shopify.com/s/files/1/0431/9602/2933/files/gomew.pdf
    • https://cdn.shopify.com/s/files/1/0432/4301/2256/files/96190329299.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_off000072cb.bin
7449eda47fb5de4f5003a1726d304fa356db02884b9a63ca0f3295db85b704db
pdf-font-stream PDF embedded font (sfnt) at offset 0x72CB 5364 bytes
font_01_sfnt_off00008522.bin
305fe602723eeb6b6cc9d37cb2557283c393ee463f9259c44a579b303cb56cc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8522 10044 bytes