Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9aa0f5e1b95a389…

MALICIOUS

PDF

50.2 KB Created: 2020-08-31 16:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 064bd87aab15ae0582f2b0a2facbd3a9 SHA-1: 20581bd9736ed3294f4bca554f3470519b8b2bae SHA-256: d9aa0f5e1b95a38917fd4235893e95127849519240c80969829d22340d22bd46
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and benign-looking PDF filenames, suggesting a lure to a malicious site. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure.

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.com/pify?keyword=apnea+del+sue%25C3%25B1o+pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/redukenedobitaguwowok.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7965/files/essentially_contested_concepts_gallie.pdf
    • https://cdn.shopify.com/s/files/1/0433/4184/0535/files/zifajenawejokonesaguzu.pdf
    • https://cdn.shopify.com/s/files/1/0444/7030/4935/files/limp_bizkit_break_stuff._mp3.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/99733721876.pdf
    • https://cdn.shopify.com/s/files/1/0437/2905/9994/files/93989885772.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/imran_khan_youth_loan_scheme_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/3063/3881/files/approaches_and_methods_in_language_teaching_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/60850311964.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/46010637365.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/99055031364.pdf
    • https://static.usrfiles.com/ugd/a18aa6_cd0fc0aa837049a980fe360c76193a18.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7b843f1e83749d39fba0c89e809f944.pdf
    • https://static.usrfiles.com/ugd/c20ea7_4f0e900310944576ac0b322859548c31.pdf
    • https://static.usrfiles.com/ugd/6203b9_a5864acfab434cc4a5043e730d13371b.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_off0000783a.bin
0dca9ed6fdd00897217a44e4457010f575e2abaff34c86cba47fb6d81642152d
pdf-font-stream PDF embedded font (sfnt) at offset 0x783A 4896 bytes
font_01_sfnt_off000088a6.bin
2ac8420813b4356fa8e059a470e3a28ed73e13f7dddd183aecde4b51c32bbbd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x88A6 10968 bytes
font_02_sfnt_off0000ac47.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC47 4324 bytes