Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5da6020e1dc30a…

MALICIOUS

PDF

48.7 KB Created: 2020-08-28 01:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8db155a9b52ee53e8a89064aad8d953 SHA-1: 784485d8aa4ef040151bb8cbb4cd3b220d56605a SHA-256: 0b5da6020e1dc30a0e26564b510ff45770663e41a4a8e7abb84ed75d4a0d2a39
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The primary malicious URL identified is https://ttraff.cc/pify?keyword=sai+baba+aarti+pdf, which is likely used to funnel users to further malicious sites. The document body itself is heavily obfuscated and contains a mix of seemingly benign text and the malicious URL, suggesting a lure to disguise the malicious intent.

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.cc/pify?keyword=sai+baba+aarti+pdf
    • http://files.bios-architecture.com/uploads/1/3/1/8/131872021/2361673.pdf
    • http://files.francocastilla.com/uploads/1/3/1/8/131856491/9939604.pdf
    • http://files.dmuenter.com/uploads/1/3/1/8/131871772/pezepu.pdf
    • http://files.gbyws.org/uploads/1/3/1/4/131483019/paludizixi-pazibokadelok-xovubonavegazuz-nobuxudisapefod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/20_types_of_amino_acids.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0448/files/73328829498.pdf
    • https://cdn.shopify.com/s/files/1/0434/8467/6249/files/23677397360.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/90974925015.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/alfabeto_griego_biblico.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4847/files/fourier_analysis_princeton.pdf
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/83402277964.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/popujizozimubefipido.pdf
    • https://cdn.shopify.com/s/files/1/0461/9314/8053/files/8435904897.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/medios_audiovisuales_ventajas_y_desventajas.pdf
    • https://cdn.shopify.com/s/files/1/0434/8900/1638/files/21332261920.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/aparajita_stotram_in_oriya.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058f9.bin
ae900dfba8c5289b9b2f6d28de81d436096843d44baeb95d4ea3d355925178db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F9 5068 bytes
font_01_sfnt_off00006a3b.bin
40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A3B 3720 bytes
font_02_sfnt_off0000759c.bin
ca23ecd2bff236dd277be53a0ecac58f5290b6b3735dba5f4f2af84a1541ec58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759C 9900 bytes
font_03_sfnt_off000097d3.bin
891f349626cb4874dfddb5fd482718de60061edf2a9fa65302931f56cd4fb2a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97D3 9488 bytes

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