Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b53e39eb2dab63b…

MALICIOUS

PDF

48.2 KB Created: 2020-08-19 10:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97534f7b8166ece8e2d53208540cff21 SHA-1: 5bcf2c4f05bca6b54034a9de63d5dec1ba617233 SHA-256: 6b53e39eb2dab63b4f3d777744c788d6c1a7caa5d54a882bdf527f999a32fbe8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for free sports content, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL confirms the intent to lead users to harmful content.

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=bein+sport+gratuit+android+apk
    • http://files.colorfulkauai.com/uploads/1/3/2/7/132710779/1833293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/65093453156.pdf
    • https://cdn.shopify.com/s/files/1/0439/5175/1336/files/ley_organica_de_la_administracion_publica_federal_vigente.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/13492297701.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/faditalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6708/8800/files/wobifi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/xaxabegobemonubezidal.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/mario_pipe_sound.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/murot.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77650869017.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/6005430775.pdf
    • https://cdn.shopify.com/s/files/1/0438/7300/9819/files/wurogezojuvasixuzi.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_off0000759e.bin
7d7f2181fa1ca6a6b8d30305ed5f875aaf1797316708cd77e1a7bb69a20409c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x759E 5208 bytes
font_01_sfnt_off00008758.bin
6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x8758 1800 bytes
font_02_sfnt_off00008fe8.bin
adcd2da82567394e8c193c3ff2c87b1c6114f62aa6600b72813b755f1ea2d796
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE8 10420 bytes