Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ff0f04163e6c6d…

MALICIOUS

PDF

60.9 KB Created: 2020-08-08 12:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20fd20565ad3a41d1f1091d07bbf079d SHA-1: b4559935b0586a8e575b5d901ebc1791616580dd SHA-256: 16ff0f04163e6c6d796f1bcdf6b8e1e37e796ac44bc3774eb93e64bf662bdc56
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=geometric+distribution+pdf+function
    • http://files.kdcfilms.com/uploads/1/3/2/3/132303133/memosu.pdf
    • http://files.johnptacek.com/uploads/1/3/1/4/131406365/668242.pdf
    • http://files.cruisingwithdonandglynda.com/uploads/1/3/1/3/131381237/4639455.pdf
    • http://files.colorandlightpaintingworkshop.com/uploads/1/3/1/3/131398095/64801.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0434/6173/8662/files/plant_molecular_biology_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/6243/3694/files/57921046562.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/national_literacy_learning_progressions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0429/4069/4684/files/42370641842.pdf
    • https://cdn.shopify.com/s/files/1/0447/1137/9097/files/the_everything_learning_german_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0453/3213/6091/files/gre_barron_12th_edition_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/autopilot_microsoft.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/deverewejonikevisan.pdf
    • https://cdn.shopify.com/s/files/1/0437/7860/5210/files/vemekuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/kejebofuzupamuriwiba.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/lyman_load_data.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ac2.bin
272087580804790015b0114d20bbebfc3d90e867eb15461b3c54a90ee4a5ee77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC2 5232 bytes
font_01_sfnt_off00009c79.bin
55fab6133ed1141999c695d704bd1f80d746a18ab64fca937ea2afa7434cb288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C79 15228 bytes
font_02_sfnt_off0000cccb.bin
8cacf1f4d0ead03d402f35ed527e3991b70db4947b2fe299868a118ad333eb25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 16580 bytes

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