Malicious PDF — malware analysis report

Static analysis result for SHA-256 492b4ea0703998ba…

MALICIOUS

PDF

46.4 KB Created: 2020-08-07 21:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fadc9165ee2202ba33fdbf34eccedac SHA-1: 532a0a2697b04806c82adacc09edcdbdd5b3c217 SHA-256: 492b4ea0703998bade39725cbb81b9f2722d720d1fb9e1097d96fe782593a1f8
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a link farm. The document body, though heavily obfuscated, contains text that appears to be a lure for a book title and a URL that matches the malicious redirector. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content.

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=el+camino+del+artista+pdf+completo
    • http://files.stmarysclinic.net/uploads/1/3/1/8/131871526/3130618.pdf
    • http://napez.uaplantscienceclub.com/uploads/1/3/0/8/130873995/gujene.pdf
    • http://files.jenniferbill.com/uploads/1/3/1/4/131408280/mirulik.pdf
    • https://cdn.shopify.com/s/files/1/0432/7355/2040/files/rumubotojez.pdf
    • https://cdn.shopify.com/s/files/1/0429/5596/4569/files/lilovadenutakomu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/dobebuwodipodasemopexigez.pdf
    • https://cdn.shopify.com/s/files/1/0435/6059/9701/files/bourbon_reforms.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/the_core_peter_v_brett.pdf
    • https://cdn.shopify.com/s/files/1/0441/3816/8472/files/nutigesaxiwebebo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/newaxomunikenarisomufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/14401411563.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1702/files/11995044452.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/notujeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/3966/1981/files/darojoxivufemevomi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/da_form_5988.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/13200450133.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_off00006920.bin
9256b782c7c465dc642b65b4ae56175e19caef00e70236e9c6e1ed6739f1f97a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6920 5044 bytes
font_01_sfnt_off00007a21.bin
dd42f39fec6144706ea5f406669e67db424257ad0f3198c8236a480af4c5b37a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A21 10516 bytes
font_02_sfnt_off00009c52.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C52 4324 bytes