Malicious PDF — malware analysis report

Static analysis result for SHA-256 127976016400930e…

MALICIOUS

PDF

38.4 KB Created: 2020-07-30 07:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff56a4095b8a849fb8aa8a3e3cac943b SHA-1: f13d7fb1a527a4c5c848598b5f1b48a61dac3f76 SHA-256: 127976016400930ed40827f0f9b3308e7f238a6c800c34945fc9790e75e4ff50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure suggests an attempt to generate traffic to malicious sites, likely as part of a link-farming or SEO-poisoning scheme to distribute malware or phishing content.

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.ru/pify?keyword=american+history+workbook+pdf
    • http://files.esoterikosparanormal.com/uploads/1/3/1/4/131406806/zesitu.pdf
    • http://files.citadeltacticalandoutdoors.com/uploads/1/3/0/9/130969166/komorivig_tolororofa_poropezeza_nolawisitum.pdf
    • http://files.kalenit.com/uploads/1/3/2/8/132815882/049f05616ad.pdf
    • http://files.gentle-giant-meadows-ranch.com/uploads/1/3/1/3/131382808/wusolunirejofu.pdf
    • http://files.phinge.com/uploads/1/3/0/7/130775384/8761084.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/90842564668.pdf
    • https://cdn.shopify.com/s/files/1/0432/6254/1982/files/54218068049.pdf
    • https://cdn.shopify.com/s/files/1/0438/2274/3712/files/gobonikozesemineniw.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/41839452358.pdf
    • https://cdn.shopify.com/s/files/1/0435/5555/3443/files/2705676700.pdf
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/36602348409.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/xinojumef.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/nutiwakezufib.pdf
    • https://cdn.shopify.com/s/files/1/0434/0465/6790/files/97637239063.pdf
    • https://cdn.shopify.com/s/files/1/0430/2520/3354/files/repopumusamamipaze.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/15152026676.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/daxamepepinopiru.pdf
    • https://cdn.shopify.com/s/files/1/0429/6310/8003/files/52988690329.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058ce.bin
c302f3b5b6fef0d0aa25b1e3a9aa045885ebcd7a3dcb6f41de70b20cbbd512a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58CE 5536 bytes
font_01_sfnt_off00006b6f.bin
306d746f132645cfd07d74a5410765b5ef6be32631d91a6fa22ae2cc0411cf28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6F 9584 bytes

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