Malicious PDF — malware analysis report

Static analysis result for SHA-256 0195084dbf05887d…

MALICIOUS

PDF

41.3 KB Created: 2020-08-15 02:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f20c2786799ad0cff0a9c707d70c02 SHA-1: e74ddd4babcacd839ba5d509edfea5fc99348b15 SHA-256: 0195084dbf05887d96fbd5a7ad16ea6c75ab235ccb0210bebfc72ca9c950e0be
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to potentially malicious redirector infrastructure. The document body and metadata suggest a lure related to "ripped pdf proof", likely intended to trick users into clicking the malicious links. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=ripped%20pdf%20proof
    • http://mystardustobservatory.com/uploads/1/3/1/6/131637830/zumixarerevelikoror.pdf
    • http://levulenof.halfacrestudios.co.uk/uploads/1/3/0/7/130776795/5a221c1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/33604364216.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/camelia_jordana_moi_c_est.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/gozosodosevixefumux.pdf
    • https://cdn.shopify.com/s/files/1/0434/0318/2231/files/86316947504.pdf
    • https://cdn.shopify.com/s/files/1/0433/0379/6894/files/35449090430.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/janegopowirivevarinujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9095/1846/files/76712539355.pdf
    • https://cdn.shopify.com/s/files/1/0435/8560/1693/files/pembaharuan_pendidikan_islam_di_indonesia.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_off00005ccb.bin
763e54d73ad184b6a681aa7c4f0954e9eb8744c9a1ffafa67120a7113edc6894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCB 4624 bytes
font_01_sfnt_off00006c9a.bin
ac799dab5157377624f08b0c1f140a0f6e45dcbc70ea8c73165162ff322a8b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9A 16788 bytes

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