Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba2dc9ebd48425f…

MALICIOUS

PDF

47.0 KB Created: 2020-07-22 13:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2878606922d6c26f783d55cc95ed25d SHA-1: 2a11b7adee2c307d00d8ae0165f4241d772ff718 SHA-256: 5ba2dc9ebd48425fd68a6e0edb9a8ad2d3a16dc95b071a287ffca3cb1c26cc61
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm strategy to obscure the ultimate destination, likely a phishing site or malware download. The ML classifier also strongly indicated maliciousness.

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.com/wb?keyword=cours%20bts%20commerce%20international%201%C3%A8re%20ann%C3%A9e%20pdf
    • http://files.artbodysoulstudio.com/uploads/1/3/1/0/131070374/e1ca5c7c21ca2.pdf
    • http://files.advancingstem.com/uploads/1/3/2/7/132740204/4a86e7f.pdf
    • http://files.foresideandalusianstud.com/uploads/1/3/0/9/130969740/4120769.pdf
    • http://files.annaclarkmft.com/uploads/1/3/1/1/131164132/texedidesupijokid.pdf
    • http://files.wolverinelacrosseclub.com/uploads/1/3/2/7/132712369/207951.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/83770246571.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/13250004602.pdf
    • https://cdn.shopify.com/s/files/1/0433/2191/7598/files/15858720489.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/15813584150.pdf
    • https://nagitoxidu.files.wordpress.com/2020/07/luluwagokurakaragibosemo.pdf
    • https://towaxoveg.files.wordpress.com/2020/07/6114708549.pdf
    • https://rizefoxug.files.wordpress.com/2020/06/99068153395.pdf
    • https://bijezopu.files.wordpress.com/2020/07/nigexiwovigawikezebeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/70500627622.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/57626988545.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/sudumeforukejopijeda.pdf
    • https://cdn.shopify.com/s/files/1/0431/8271/9136/files/16151948706.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/dewidufabaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/85493444948.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/52944194230.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/xanin.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_off0000745a.bin
404d50d1732f010cc5c3dc4021811c384980a859b313a77dad1f96fe524551e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745A 5684 bytes
font_01_sfnt_off00008703.bin
4af88044e0ef2d8ae8510990e30b2d450a15374cbb666413c6b6851cb3d5efb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8703 11628 bytes

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