Malicious PDF — malware analysis report

Static analysis result for SHA-256 9985a0dcf66b0f15…

MALICIOUS

PDF

49.6 KB Created: 2020-08-10 08:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99a4406458826269686575a5ac8de918 SHA-1: 572c74731a3b4b4559d24a65727ff6f746a70579 SHA-256: 9985a0dcf66b0f1584c5f00b3a36a1651964836e213b1bde5fe9c0d1dde51572
150 Risk Score

Malware Insights

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

This PDF file contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text that appears to be a lure related to "translation reflection rotation worksheets pdf". The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The ML classifier strongly indicated maliciousness.

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.ru/pify?keyword=translation+reflection+rotation+worksheets+pdf
    • http://files.newspringscommunity.org/uploads/1/3/1/3/131384127/2837e2725.pdf
    • http://files.tprb1023fm.com/uploads/1/3/1/3/131381555/dabepoxotipogetosu.pdf
    • http://files.rim-foundation.org/uploads/1/3/1/4/131453214/wolinugime_jenotenawapi_wituvixiwulejam.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/25009100686.pdf
    • https://cdn.shopify.com/s/files/1/0431/1708/4839/files/kibejakonilo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2858/files/69996807889.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5293/files/myasthenia_gravis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/rexazujuwatefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/nmr_spectroscopy_applications.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/rebetisubekiwelaludaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/wafiragugebubiziw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/english_to_bangla_vocabulary_for_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/7114602196.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pifafesilepobusofamut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1821/files/88387429970.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1112/files/xuguxif.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_off000083be.bin
146bcb1c253016a509abc231ab6fadd58b780b5f4328e7989bd7d1ba2156ea38
pdf-font-stream PDF embedded font (sfnt) at offset 0x83BE 5348 bytes
font_01_sfnt_off000095fa.bin
8ade48fb87791dd8bdbeb94944b8637b01edf3ea69894a4f28c5aaa47b8ac5fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x95FA 10216 bytes