Malicious PDF — malware analysis report

Static analysis result for SHA-256 b557e58ea4741617…

MALICIOUS

PDF

47.1 KB Created: 2020-08-12 03:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0f8360166bafd53a94c37fc4f448566 SHA-1: febc1c7f907f4ba3f65cda2735426a43853193cd SHA-256: b557e58ea474161721b24207992339def7a6d9c3be0451113040bb766b81678e
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, contains text related to 'Brain on fire full book pdf' and the malicious URL, suggesting a lure to download a malicious file disguised as a book. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the presence of a malicious redirector and a link farm indicates a phishing or malware distribution attempt.

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.com/pify?keyword=brain+on+fire+full+book+pdf
    • http://files.liferenewalcounseling.org/uploads/1/3/0/8/130874143/wosotilega.pdf
    • http://natesu.afiniadentalportal.com/uploads/1/3/0/7/130740434/tevujaniwid_mupebelosuromiz_xirus_tutugigexovin.pdf
    • http://jogaluwo.bigtrecreation.com/uploads/1/3/2/6/132681394/mofedipuponubo.pdf
    • http://files.satorico.net/uploads/1/3/1/3/131384468/5375225.pdf
    • https://cdn.shopify.com/s/files/1/0451/9510/0311/files/rujogibimosafo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/garden_tool_shed_plans.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/bodmas_worksheets_for_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/ronozadabaxakopululel.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/xoraxanodugatilaf.pdf
    • https://cdn.shopify.com/s/files/1/0439/0833/3736/files/chess_openings_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/3399/2085/files/musica_andina_peruana.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/fiwudedotuxobe.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/65714925526.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/midoz.pdf
    • https://cdn.shopify.com/s/files/1/0440/3986/4485/files/53503574601.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/87319340369.pdf
    • https://cdn.shopify.com/s/files/1/0434/3716/2657/files/beginner_spanish_words.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/46000422849.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_off00007aa4.bin
285a099b4b5932f8098ffbbf7a53dbaa8a999b2804a84397968f75eedc280cdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA4 5112 bytes
font_01_sfnt_off00008c0e.bin
8fad6e84a554d9951e6924cf3a11507b6039a1da0192b370440250c344b9e417		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0E 10316 bytes

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