Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6b3c772ce1da7e…

MALICIOUS

PDF

33.1 KB Created: 2020-08-19 22:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d37b768323b8572f12092644c6c78250 SHA-1: 629b179c1e7af005fddb580eba37f946c31d68f8 SHA-256: ec6b3c772ce1da7e62de3f0f1ecff39261f4ca3942377dc66bd4ff540dd6c8b6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a lure related to "Sat physics subject test answer sheet" and embeds multiple links. One of these links, https://ttraff.cc/pify?keyword=sat+physics+subject+test+answer+sheet, points to a known malicious redirector. The PDF also hosts a large number of other PDF files on Shopify domains, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=sat+physics+subject+test+answer+sheet
    • http://bawoz.iremuny.com/uploads/1/3/0/8/130874038/dibotej_vifer_xotalatop_neguneviva.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/92257854100.pdf
    • https://cdn.shopify.com/s/files/1/0439/2206/3515/files/49574660257.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8133/files/wogagedasurowiso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/bafisajirebikijanipuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zorosibal.pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/nuxesinitoran.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/10999640615.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobuwavidojanunixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2067/files/bugazobenapasoze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20011772627.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_off000043a7.bin
2c587c55bf8ba1701a930df2ad3ea0d1a6d5c8c3a9a92ea20e9d9cf5b4914e2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x43A7 5504 bytes
font_01_sfnt_off00005659.bin
0db11578976ef484428217ecb240f02f1e9f77c96f24de3a7bc5c3aa4bd04d71
pdf-font-stream PDF embedded font (sfnt) at offset 0x5659 9760 bytes