Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58805ba56ef882f…

MALICIOUS

PDF

49.5 KB Created: 2020-07-22 21:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4526e9ca02616fc33cbd42437479de5 SHA-1: 18975ef73e458b7aad98127ee55c01153e79a32b SHA-256: e58805ba56ef882f179ffb997333bb6225504b1f1eee02b553bcf639398708ee
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with the primary heuristic identifying a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links suggests a link farm or redirection attack designed to lead users to malicious sites.

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.com/wb?keyword=klasifikasi%20cephalgia%20pdf
    • http://files.mrsdonahue.org/uploads/1/3/1/4/131452967/nikiviva.pdf
    • http://files.whollysimcha.com/uploads/1/3/1/4/131411539/zedasevusorekot-kujikelid-navupe-takive.pdf
    • http://files.aerialarthouse.com/uploads/1/3/2/8/132814505/2665326.pdf
    • http://files.ellenalt.com/uploads/1/3/1/0/131070538/burozetowikexijefa.pdf
    • http://files.3dvitog.com/uploads/1/3/1/6/131636745/7044803.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/98399889597.pdf
    • https://cdn.shopify.com/s/files/1/0437/0225/5770/files/detekoxex.pdf
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/75814849521.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/91059825085.pdf
    • https://budimonisak.files.wordpress.com/2020/07/94226511811.pdf
    • https://lifekatido.files.wordpress.com/2020/06/58711876864.pdf
    • https://bugigos.files.wordpress.com/2020/06/90462308544.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/wojigaxevupugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8469/files/juzuwapa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3474/6790/files/naviralefubapipuluwevapag.pdf
    • https://cdn.shopify.com/s/files/1/0431/2625/9876/files/25237182340.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/5668391035.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/pozisowifoj.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/
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000848b.bin
1e74f77d400571f9babd075446b5ee1d58da62dbfd8c15b446ebef062e66b77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848B 4844 bytes
font_01_sfnt_off00009509.bin
5de6ff9d659e0bcfce728e1867cb11dbf5abfc0b40b3ac76898b9f65daf594ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9509 10488 bytes

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