Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da79efc7a7354ed…

MALICIOUS

PDF

40.4 KB Created: 2020-08-19 01:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d772c13304bb8698c9b25e8a88c5f2d SHA-1: b4f3093720bb62b329a4bdf93808da4f8a25bd59 SHA-256: 6da79efc7a7354edf8341c1df8d3b6e5fc3bb90146b00139043320b15093c61c
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the heuristic finding, suggesting an attempt to redirect the user to malicious content or further downloads.

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=cp33+lightning+protection+pdf
    • http://wekatoxit.kierlandpop.com/uploads/1/3/1/4/131408229/dokimoji.pdf
    • http://files.laurengoldsteinart.com/uploads/1/3/1/1/131164424/1d5da19bba5c51.pdf
    • http://files.lhsperformingarts.com/uploads/1/3/1/8/131856435/pelamirumel.pdf
    • http://files.creativepathwaysprep.com/uploads/1/3/0/7/130739652/wuzixegi_bojexaxosi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3427/1126/files/keruziniz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/xerarugavidexunimajonot.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/92759292760.pdf
    • https://cdn.shopify.com/s/files/1/0431/5932/2773/files/wajob.pdf
    • https://cdn.shopify.com/s/files/1/0430/3382/1347/files/lolamalitevuzomubuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0681/1560/files/mamul.pdf
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/retinosis_pigmentaria_scielo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8428/files/48278171192.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/daxirok.pdf
    • https://cdn.shopify.com/s/files/1/0434/4755/0119/files/xabibibesexeleg.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_off0000623b.bin
7d3c89224139a85a6d9be2b0a2e84e2b3c3160a181da0a89c7340221b9d3356f
pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 5100 bytes
font_01_sfnt_off0000738a.bin
fb14e1a99ba68bbe92f8c3f0cf0b8cb27d5838814ca14b11a6fab1a78622d9b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x738A 9756 bytes