Malicious PDF — malware analysis report

Static analysis result for SHA-256 a282b459b493adba…

MALICIOUS

PDF

42.8 KB Created: 2020-08-21 00:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8728424cdc96c84d828a5983dc1814d SHA-1: decaf7be4aca4bffbc32c045e55e8aa77d330672 SHA-256: a282b459b493adba3e1ecb2b3de378f1e57d528704ae1d6fc08bc252d0f6d3bf
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of external links. One of these links, 'https://ttraff.ru/pify?keyword=fainting+first+aid+pdf', is identified as a known malicious redirector. This suggests the document's primary purpose is to direct users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the immediate intent beyond link redirection.

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=fainting+first+aid+pdf
    • http://gakosuj.kevindeaneparker.com/uploads/1/3/1/3/131384281/22a5aff9a.pdf
    • http://files.nursinghomepj.com/uploads/1/3/0/7/130776296/vadifadi-bezefugabepamu-lorasoridosom-lizejarunofal.pdf
    • http://daraxud.figmentsandphragmites.com/uploads/1/3/1/4/131482975/gukor.pdf
    • http://files.laperdriere.org/uploads/1/3/0/8/130873791/bujenipafob.pdf
    • http://files.lymarimiranda.com/uploads/1/3/1/3/131380723/7107550.pdf
    • https://cdn.shopify.com/s/files/1/0429/5367/0822/files/apprendre_franais_dbutant.pdf
    • https://cdn.shopify.com/s/files/1/0429/5950/3519/files/lalupizilikijonedomagipon.pdf
    • https://cdn.shopify.com/s/files/1/0452/2138/0247/files/death_of_a_salesman_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/2020_nissan_armada_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/diagramme_de_phase.pdf
    • https://cdn.shopify.com/s/files/1/0433/1811/6510/files/cet_2020_answer_key_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/8901/7497/files/6914219660.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/23292661094.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/38682582855.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2773/files/musabotukajatiberix.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_off00006a0a.bin
d5c90dde7930a1691c91bea807b2ad66b7929049379a093c23aa7cb140d87c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0A 5132 bytes
font_01_sfnt_off00007b91.bin
d269e6c42cead71d434ef1ea958525ae23747dfcc5cc3dbc6c5122fc62413f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B91 10328 bytes

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