Malicious PDF — malware analysis report

Static analysis result for SHA-256 1119a1f2fd8a8aa3…

MALICIOUS

PDF

36.5 KB Created: 2020-08-26 01:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 894e6ca01f186758a8a60a0c5779c983 SHA-1: 104aa9824e3dbc8f3cc729781d514b0cdf04ee84 SHA-256: 1119a1f2fd8a8aa3f67b6aa889c9cc1f6f8a26ca126fb6bda89cadfabe452355
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, suggesting an attempt to lure users to external sites. No scripts were extracted, but the PDF structure and embedded links point to a malicious redirection or phishing attempt.

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=wavread+matlab+2016
    • http://gagazol.renoirpropertygroup.com/uploads/1/3/1/0/131070306/c6086e65562d6.pdf
    • http://xasimas.azusaconservatory.org/uploads/1/3/0/8/130874591/vasovipowe-jomupituvugomo-topalu.pdf
    • http://files.broncohack.net/uploads/1/3/1/3/131398242/vodaliva_zodozatonikos.pdf
    • http://files.stalbansepiscopalhouston.org/uploads/1/3/2/7/132740756/2214274.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/3734040922.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/4540922987.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/18295359749.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/suwimabuvosata.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9222/files/68905990966.pdf
    • https://cdn.shopify.com/s/files/1/0437/7768/7701/files/html_phone_book_template.pdf
    • https://cdn.shopify.com/s/files/1/0460/3799/1583/files/bachon_ki_poem_full_hd_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/91882822237.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7641/files/pupolo.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_off00004fca.bin
16eae134db9c71587d8ca418772f6cc22270bfa5531aa826644ca4d8379dd387
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCA 5484 bytes
font_01_sfnt_off0000626d.bin
d43618c811f7c02a7b0531035a0c505bdd24a2c0ef971172d15da0a168a07d63
pdf-font-stream PDF embedded font (sfnt) at offset 0x626D 10456 bytes