Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb9353f729b6a82…

MALICIOUS

PDF

37.4 KB Created: 2020-08-11 23:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e059fee77238c860fb94a4a6220a9ef SHA-1: 62132c2a9880678478431f4ac3d406ddc02fbdcf SHA-256: 5eb9353f729b6a821c90c49451a8d0dd9c3fcd528382dabafb1eaa11f27e4b8f
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, includes the target URL and references 'libros pdf', indicating a lure to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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=aprendizaje+cooperativo+libros+pdf
    • http://files.bluecrushvolleyballclub.com/uploads/1/3/1/4/131453100/dokugaboruluz_runizarijuxekuk_funakelenev_loweti.pdf
    • http://wulunew.eandrewmurrayphotography.com/uploads/1/3/0/7/130775850/1557476.pdf
    • http://files.rockridgewoods.com/uploads/1/3/0/8/130814209/25359a83991.pdf
    • http://files.athenscountystorage.com/uploads/1/3/0/7/130775511/jaxugokeba-loket.pdf
    • http://rojam.czsworld.com/uploads/1/3/2/8/132814930/wexavupiwu-bopajuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0636/9703/files/cbr_1000_repsol.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6351/files/65226021574.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/tegikotimorubosixokod.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/ludaxagegilof.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/tuligaworelogupun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5475/9069/files/60073986621.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/15565476423.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/badezokejo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/rifatopezodarasar.pdf
    • https://cdn.shopify.com/s/files/1/0437/5298/0641/files/34595549462.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/71877722393.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/19132574455.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/momox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000482a.bin
a29446890cf9743ea46e85e866f8795fa363983f1ba821e8ce5f6c3bab742aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x482A 5252 bytes
font_01_sfnt_off00005a0d.bin
168916c7d614ffbf3a6727775bbefd4e3d8ebd28936bb786108b6ab39768263e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0D 9508 bytes
font_02_sfnt_off000078ca.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CA 4324 bytes

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