Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5a83bb377f1230…

MALICIOUS

PDF

42.1 KB Created: 2020-08-05 01:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42d853cf8afc7c783a6047bbc5e984fb SHA-1: 6a653e73c5d0fa793905657cd62910bde36abf4d SHA-256: ee5a83bb377f12304dff781317c789c50a3c995b413923c86347c9b8cea28134
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=biostar+handbook+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The primary malicious link likely leads to further malicious content or phishing attempts.

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=biostar+handbook+pdf
    • http://files.middsga.com/uploads/1/3/1/3/131380480/gutaxavud.pdf
    • http://files.alliancerestorationkc.com/uploads/1/3/1/3/131379111/zipimerebekogit_nezobatojemite_motenot_javejapiv.pdf
    • http://files.idahotaxidermistsassociation.org/uploads/1/3/1/3/131380848/6286745.pdf
    • http://files.rdiallog.com/uploads/1/3/1/1/131164520/fazejazobikip.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/bufeteloxiso.pdf
    • https://cdn.shopify.com/s/files/1/0434/5747/8823/files/4951693390.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/82329718209.pdf
    • https://cdn.shopify.com/s/files/1/0437/7988/3170/files/divifolesopag.pdf
    • https://cdn.shopify.com/s/files/1/0428/2764/5084/files/85188821996.pdf
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/genetics_essentials_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/2273/5767/files/34363404447.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/56622344297.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/sijukelawor.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/wupijifekejekifutira.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/logiciel_de_traduction_de_fichier_anglais_francais_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/jexib.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_off00006562.bin
a45bd601dfad64bade5f41c802b05d27890614ee9f68c928857ff2cfad6cf943
pdf-font-stream PDF embedded font (sfnt) at offset 0x6562 5348 bytes
font_01_sfnt_off00007784.bin
cfc4b67937cfc4fe94e413444cda61050f90a01b63d40bd7fcd6234b062dde89
pdf-font-stream PDF embedded font (sfnt) at offset 0x7784 10512 bytes