Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d0a48623fcd9dc…

MALICIOUS

PDF

39.9 KB Created: 2020-08-15 22:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbd894ea9fe1ff3db90f7768d45f4ceb SHA-1: 7559d3d3c17649a35f1904fbaaf82a930a2974ee SHA-256: b7d0a48623fcd9dc5b17e1a2c8989f3d35e728204fefce74862783bbb8aff0ee
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to host malicious content. One of the primary links redirects to a known malicious domain, ttraff.cc, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, indicates an attempt to disguise the malicious intent as an educational worksheet.

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/wb?keyword=present%20tense%20worksheet%20for%20grade%203
    • http://files.caresga.org/uploads/1/3/1/3/131379343/xaxukebutuzinup.pdf
    • http://duzolirim.roundthecampfire.org/uploads/1/3/1/1/131164250/e8c9b5f5f7c71.pdf
    • http://files.changlaoshiclassroom.com/uploads/1/3/1/8/131857758/5489288.pdf
    • http://files.mrrclassroom.com/uploads/1/3/0/8/130873995/zifupekeluxut_lijavopupuwima.pdf
    • http://files.humboldtcountychamber.com/uploads/1/3/1/1/131163740/badifinolage.pdf
    • https://cdn.shopify.com/s/files/1/0438/2559/4530/files/93308059463.pdf
    • https://cdn.shopify.com/s/files/1/0432/4163/5997/files/30439349652.pdf
    • https://cdn.shopify.com/s/files/1/0439/3009/1688/files/sample_resume_for_assistant_professor_fresher.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2626/files/adjetivos_en_ingls.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/situmusene.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8600/files/mapominerunasoxe.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/43366651524.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/24191286318.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0583/files/56269075777.pdf
    • https://cdn.shopify.com/s/files/1/0430/7134/0698/files/dutotagadufuwixagimasiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/kuxesafetozekiteme.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_off00005ba3.bin
694fe9fb1b7e0919a8dea1818de77bdece674d9847c3ac87189081fa094aa213
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA3 5460 bytes
font_01_sfnt_off00006e3c.bin
d2102c532b2e34bff1c78f4a2c6af34b1f596b0fbb86a20ac7b99506c8e43f27
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3C 10616 bytes