Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f872084049dd0d…

MALICIOUS

PDF

52.5 KB Created: 2020-08-20 13:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 323378b377ebdf3345286ad26414a6f9 SHA-1: e19fff205d58cea304ce9fc684d2bc1592320d93 SHA-256: 17f872084049dd0d9b77fdbc2bc1cf94465a1dd7e27197e6c58ae083ba36f5b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO spamming tactic. One prominent URL, 'https://ttraff.com/pify?keyword=saccular+vs+fusiform+aneurysm+radiology', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect the user.

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=saccular+vs+fusiform+aneurysm+radiology
    • http://files.kunzangincense.com/uploads/1/3/0/9/130969390/3538950.pdf
    • http://files.productofthebay.net/uploads/1/3/1/6/131606011/tukozepevodimu-naxip-rarem-gakonajiwudew.pdf
    • http://gajigoka.xmastrees.org.uk/uploads/1/3/2/7/132740478/xerebezezara-sobimumaxawib-ximerakodirezef-zapoj.pdf
    • http://tedigasi.rigonibakery.com/uploads/1/3/1/3/131380212/4866978.pdf
    • http://gulaxoj.sanfranciscofamilytherapy.com/uploads/1/3/0/7/130776138/0945e13.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/97490647397.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/62330679950.pdf
    • https://cdn.shopify.com/s/files/1/0431/1272/6677/files/10th_maths_guide_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0441/9478/files/81632541721.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/12566690511.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3553/files/magetiwizarevajelaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/83355191244.pdf
    • https://cdn.shopify.com/s/files/1/0438/4659/8816/files/el_camino_del_artista.pdf
    • https://cdn.shopify.com/s/files/1/0436/3865/3081/files/gezijoxidepiwesijovij.pdf
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/desurefipiburibosuwilulo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7007/6566/files/74020623016.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d8a.bin
56b2505b41ab2fef3ebd8d04ebcbd3045006ed5c951dd71f304e6a7f2efab44b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8A 5604 bytes
font_01_sfnt_off0000a086.bin
b705d39d4829e0a5c3d313d271b68e02dad7aac887c15ec0ad24a707c11027b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA086 10540 bytes

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