Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b47ff4cee46311…

MALICIOUS

PDF

36.1 KB Created: 2020-08-12 18:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4e9143d5b9168a93bd8d5fb70cc9b5a SHA-1: 7833183f753c15d8a240566cbd7bd912ac48c263 SHA-256: 95b47ff4cee4631150bbad898241dc3a62cbff0cd79175d3c66d45b60d2435c1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=biblia+pdf+chomikuj'. This URL is likely part of a phishing or SEO spam campaign designed to lure users to malicious content. The document body also contains this URL and numerous other links hosted on cdn.shopify.com and other domains, suggesting a link farm or content distribution network used to obscure the true malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=biblia+pdf+chomikuj
    • http://files.marketmovesmatt.com/uploads/1/3/0/8/130874629/nuvigure-bufagejiv.pdf
    • http://lesuz.thelauraxadventures.com/uploads/1/3/1/3/131380005/259496.pdf
    • http://files.nazbahtom.com/uploads/1/3/0/7/130740510/9595851.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/adivinanzas_con_respuestas_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/gewanawijewijezi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/98645545210.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/vopaxopoguzadexi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8758/5699/files/16874036442.pdf
    • https://cdn.shopify.com/s/files/1/0438/0606/4801/files/15441330560.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1702/files/betaistina_24_mg_bula.pdf
    • https://cdn.shopify.com/s/files/1/0434/1157/0838/files/pelolivefegasomiwiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2292/6492/files/gabriel_garcia_marquez_chronicle_of_a_death_foretold.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/sapareresajolomewonoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/spectroscopy_principle_and_application.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/kagerazoxewerexugowazef.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_off00004ffd.bin
1796ef7b69aa6a1f426b63f0ba20b570ab87f65acb26148b9276a3382b1c4c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFD 5448 bytes
font_01_sfnt_off0000625d.bin
fe147f267439524d698a363afc274729ba9dba65219f7309323ad00e735e6610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625D 9784 bytes

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