Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9256bed537f8cc…

MALICIOUS

PDF

49.0 KB Created: 2020-08-07 23:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa970b1fff25ad6b28e5da741e2dbcf7 SHA-1: 5227bfd6ea9daaf28ecbb7756dc21ab6e7457255 SHA-256: fe9256bed537f8cc5bcf7eb9485df7e6e8b3a81f73a2756e89eead6d21737635
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to external resources, which is indicative of a link farm or redirection scheme. The primary URL, https://ttraff.com/pify?keyword=definicion+de+contaminacion+del+aire+pdf, is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to air pollution and the tool used to generate the PDF, suggesting a lure to disguise the malicious intent. The ML classifier strongly supports the malicious verdict.

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=definicion+de+contaminacion+del+aire+pdf
    • http://files.christopherenston.org/uploads/1/3/0/8/130814902/1437365.pdf
    • http://files.baagaadowekwe.com/uploads/1/3/1/4/131437119/11bf86147902.pdf
    • http://files.grownfolkmotto.com/uploads/1/3/0/7/130738919/94ca3.pdf
    • http://files.teamroyalty1990.com/uploads/1/3/2/7/132712234/6436658.pdf
    • http://files.destinationdelicious.com/uploads/1/3/0/7/130775363/2726495.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/wutabomagiboxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2776/files/jixavagejunofivof.pdf
    • https://cdn.shopify.com/s/files/1/0429/2182/0313/files/99813438205.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/starboy_the_weeknd_album_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/65229283805.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/how_to_type_in_italics_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/network_technician_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/mesiloleranepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/halter_top_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/39652978916.pdf
    • https://cdn.shopify.com/s/files/1/0433/3145/3081/files/kizofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/87508917385.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/buccal_mucoadhesive_drug_delivery_system.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007319.bin
f7c5b841c03c1a16989dc70c372257b48299f57d80a97e62dd82b9340b775cec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7319 4912 bytes
font_01_sfnt_off000083aa.bin
1d853ac2aa8b4f166e6271b3b359c73c6bb8215f8209e3674af66d27cc7ad622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83AA 11016 bytes
font_02_sfnt_off0000a709.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA709 4324 bytes

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