Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a1419270e4f6bb…

MALICIOUS

PDF

48.5 KB Created: 2020-08-17 11:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 211662bb0d958669f6bd93f1bb8de764 SHA-1: c04cfe9f463878e21cf56b89948fd67bbc5ee93a SHA-256: 99a1419270e4f6bb8f989a56c85b471a033b9bf353fbb6c0508f60749f375669
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'method validation usp guidelines' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing a mass external link farm.

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=method+validation+usp+guidelines
    • http://files.kokcouture.com/uploads/1/3/0/7/130740011/3238484.pdf
    • http://leterar.musicspabox.com/uploads/1/3/0/7/130776779/fajisofolowakoxogena.pdf
    • http://files.ashleyparsonsyoga.com/uploads/1/3/2/7/132740415/newixebomufobezofawe.pdf
    • http://files.carbonprecision.com/uploads/1/3/2/7/132740285/kadibaxalikelirerej.pdf
    • http://zegowib.elainesessentialoils.com/uploads/1/3/1/4/131437363/tawipij_duzerukiz_jigupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/98830757573.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/aparatos_de_ortodoncia_infantil.pdf
    • https://cdn.shopify.com/s/files/1/0434/2510/4028/files/fajofulaxuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6962/7799/files/26926479460.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/tesis_sobre_el_bullying_escolar.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/mapa_cercanias_madrid.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/64383155324.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/38194921946.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7249/files/rezasanoxokuradafema.pdf
    • https://cdn.shopify.com/s/files/1/0432/8148/1884/files/fraktur_acetabulum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/vebuzugarofawosuponuzif.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080a0.bin
bf455bba6705495d160c7c70decfca76489be06a1c9ffad1870de717868aa245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A0 5192 bytes
font_01_sfnt_off00009256.bin
2e0a3b6dd40b3fb197a018c7f863bf32aa5d47563042a0bb920f87ecc1011759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9256 10240 bytes

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