Malicious PDF — malware analysis report

Static analysis result for SHA-256 38defee4f9b0ad36…

MALICIOUS

PDF

49.0 KB Created: 2020-08-10 22:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee706f2266849c5280b81004e57a27e3 SHA-1: 70c456bdc1efe99b9d78bd87f0c32467ef63e316 SHA-256: 38defee4f9b0ad3638966df9c93e3d82e0c7e765a1dbbf53478243af0b948218
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search engine results, directing users to a malicious redirector at 'https://ttraff.com/pify?keyword=almacenamiento+de+agua+potable+pdf'. The document body, though heavily obfuscated, contains this URL and numerous other links hosted on Shopify, likely to lend an appearance of legitimacy. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a malicious redirector.

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=almacenamiento+de+agua+potable+pdf
    • http://files.schifferpublishingltd.com/uploads/1/3/0/8/130813042/5762199.pdf
    • http://files.resources4educators.com/uploads/1/3/0/8/130814226/8240647.pdf
    • http://files.dannypics.com/uploads/1/3/1/3/131398219/zukogikotix.pdf
    • http://files.frombeyondrecords.com/uploads/1/3/1/1/131164310/rurapix_migafamaxurozuk_rujav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/64545740748.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/poxopajapalog.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/21082934365.pdf
    • https://cdn.shopify.com/s/files/1/0433/5403/0231/files/99723446016.pdf
    • https://cdn.shopify.com/s/files/1/0434/1704/3101/files/dawofenipuxudeve.pdf
    • https://cdn.shopify.com/s/files/1/0452/9078/2881/files/calidad_total_libro.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/medical_certificate_form_tamilnadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/xiguzaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/46615766894.pdf
    • https://cdn.shopify.com/s/files/1/0432/1198/0964/files/rakafegolojemazesiwiwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3952/1958/files/33757768306.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/xifazeninafadogizavin.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_off0000766c.bin
fdb263c217760de2518c0f756579dc9dee8f2d982708a62654372d3f07ab4b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766C 1856 bytes
font_01_sfnt_off00007e87.bin
1c3c10e25a3e1921e6ff3d755b610c3dd3d3127701e8fcd2b92ffc6fe42f15cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E87 5328 bytes
font_02_sfnt_off0000908d.bin
0a77d9ab326578c0fff5df543ab2ca8c7acd79dc02f91fe152150366203514ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x908D 11352 bytes

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