Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bce40b51e0f5cab…

MALICIOUS

PDF

46.7 KB Created: 2020-08-02 08:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de3e8ba0612cc03e8a742622c5634dab SHA-1: f45305f2ad706728d10e2324995f124e4a969ed1 SHA-256: 2bce40b51e0f5cabbd09966dbdd40cbb7bed43a22457d2cedee706eef2ab0e5f
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to `ttraff.cc`, a known malicious redirector. The document body text, though garbled, includes the string 'Morrowind graphics extender' and the URL `https://ttraff.cc/pify?keyword=morrowind+graphics+extender`, suggesting a lure to download potentially malicious content. The ML classifier strongly supports the malicious verdict.

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=morrowind+graphics+extender
    • http://files.ekphrastic.net/uploads/1/3/1/4/131409305/a6c85099869.pdf
    • http://files.unitedchinchristianchurch.org/uploads/1/3/1/4/131483344/zolilu-kexaxagaju-gexawupoze.pdf
    • http://files.photographybyemeliadeweese.com/uploads/1/3/1/4/131453990/3155606.pdf
    • https://cdn.shopify.com/s/files/1/0431/0712/3357/files/zubofotisusumeme.pdf
    • https://cdn.shopify.com/s/files/1/0429/5006/6339/files/zevalovegotafibozab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6617/9230/files/47882150323.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/80511037901.pdf
    • https://cdn.shopify.com/s/files/1/0440/6103/2598/files/fewogebefobozekuba.pdf
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/galobuwufux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0432/9753/8203/files/naresero.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/24447258019.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/norisem.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4031/files/zetuloxeturabinin.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/89739511047.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_off00007110.bin
1b06ebe038ec93b25d00700b3b023be4b8cbf6b94e95d7fbccb354a9c6e2c040
pdf-font-stream PDF embedded font (sfnt) at offset 0x7110 5468 bytes
font_01_sfnt_off000083cc.bin
bb22315b29c619d1815b74ba3d4f744e0c6440f3be2fc5f0bcb03036bf7f47e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x83CC 13188 bytes