Malicious PDF — malware analysis report

Static analysis result for SHA-256 537816bca5a1e8fb…

MALICIOUS

PDF

45.0 KB Created: 2020-08-07 18:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a78e529cecbe37fa7363794c52ca166 SHA-1: 20a8d516722ba4d5fa7bea7d288c3996605363bd SHA-256: 537816bca5a1e8fbebd7e38cbad7b6efe6a7f0853c5e2d54bb2ed99e2dec498d
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The document body, though partially corrupted, suggests a lure related to 'TCS verbal ability questions with answers PDF download'. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to malicious content, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure and link analysis strongly suggest a malicious intent.

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.cc/pify?keyword=tcs+verbal+ability+questions+with+answers+pdf+download
    • http://files.ela8blog1.com/uploads/1/3/1/4/131453615/9447459704bca28.pdf
    • http://files.alliancerestorationkc.com/uploads/1/3/1/3/131379111/zipimerebekogit_nezobatojemite_motenot_javejapiv.pdf
    • http://files.naomibourque.com/uploads/1/3/2/7/132741334/tikixurew.pdf
    • http://files.jagodadobecka.com/uploads/1/3/0/7/130776408/5744682.pdf
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/internet_intranet_and_extranet_difference.pdf
    • https://cdn.shopify.com/s/files/1/0429/8516/0857/files/51645736539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0435/2484/9815/files/serawilegikapipur.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/jafexopojuneduxusemi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/online_translator_tamil_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0440/8187/3048/files/american_english_file_starter_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0957/files/acta_constitutiva_de_una_sociedad_anonima_mexicana.pdf
    • https://cdn.shopify.com/s/files/1/0435/5257/1555/files/48949211116.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/95428263344.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/5569426697.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_off00007092.bin
7234bcd2e41c1ea9e99bd5e1aba6d5037c2b3009a8f67bd4c18b8cdd3217c6fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7092 5712 bytes
font_01_sfnt_off0000841b.bin
073c67497bec79a7a9ed8201d089d45d2531738caabfd4307ffe2aedbe301c23
pdf-font-stream PDF embedded font (sfnt) at offset 0x841B 10128 bytes