Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8d50e71951e989…

MALICIOUS

PDF

41.0 KB Created: 2020-08-20 19:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef7be5e7ad7ea3c3989e3478f5dd5ffa SHA-1: 836c1738deb7d0a27126f32c7a8c0cdb543800b1 SHA-256: 7e8d50e71951e9891242be50dab503d2e99e980cd8ce8caeb8d1a9c95fcaba6d
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.ru/pify?keyword=introduccion+a+las+energias+renovables+pdf. The document body, though heavily obfuscated, also contains this URL and numerous other links, suggesting a social engineering tactic to drive traffic to potentially harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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=introduccion+a+las+energias+renovables+pdf
    • http://files.benztransport.com/uploads/1/3/0/7/130775260/batobunan-mafikok-gomaz.pdf
    • http://lejut.laraefx.com/uploads/1/3/2/8/132814930/2b4cc0f414859.pdf
    • http://nebupuwij.tskjesusfreak.com/uploads/1/3/1/3/131383483/a88c31.pdf
    • http://files.theothertoledo.com/uploads/1/3/1/3/131380995/kurusotuneje.pdf
    • http://files.modernhistoryseminars.com/uploads/1/3/0/7/130740624/68f69b674b9.pdf
    • https://cdn.shopify.com/s/files/1/0433/3964/5093/files/ditelurutogajizasafapasa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/gikavez.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8917/files/20767933064.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/wudoveni.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/gepudibiralezaxijafedede.pdf
    • https://cdn.shopify.com/s/files/1/0431/1040/0153/files/numerologia_cabalistica_a_ultima_fronteira_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/arbitration_and_conciliation_bare_act_1996.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7579/files/wopepesunemepi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/citizenship_definition.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_off00005f8f.bin
2ad6e1ea91442d123efd719cb66f1608e35d435fd60135a04d6f7ce5167f9184
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8F 5460 bytes
font_01_sfnt_off0000722d.bin
2355ec571a3ff15c06ed97174840c503627f6e1953e7efaae5e3ac4e4ad64dd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x722D 10816 bytes