Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f914ec1374fe8c7…

MALICIOUS

PDF

45.4 KB Created: 2020-07-22 10:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 236048828a9276861a25bcbcb901f44e SHA-1: 700f79515287e1743f8a42cb4bacafd569083b3a SHA-256: 9f914ec1374fe8c7060503dbd080f48d7a3351912e9b947592d8eb0fd8bcb5c1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Function of cranial nerves pdf'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The presence of multiple Shopify URLs suggests an attempt to blend in with legitimate content while distributing the malicious payload.

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/wb?keyword=function%20of%20cranial%20nerves%20pdf
    • http://files.carnoustieclaymores.com/uploads/1/3/0/8/130874672/2944097.pdf
    • http://files.orian.us/uploads/1/3/0/7/130739234/xuxakiwudegig_zuvupalagit.pdf
    • http://files.graftonchildcare.co.uk/uploads/1/3/0/7/130775969/xozarikatemejogigezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pijajaza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/79166415679.pdf
    • https://cdn.shopify.com/s/files/1/0436/0372/2402/files/94609577066.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/figamopalutitajak.pdf
    • https://sudevoxe.files.wordpress.com/2020/06/magemujawegil.pdf
    • https://jikekivadu.files.wordpress.com/2020/07/ruwomasivamozu.pdf
    • https://jifapikolaga.files.wordpress.com/2020/07/47435356200.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/loxapemirewota.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/kiludaginugozalig.pdf
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/vijewoma.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/16945789132.pdf
    • https://cdn.shopify.com/s/files/1/0428/1470/1735/files/90426961681.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/julanefiwozuxam.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/
    • https://sudevoxe.files.wordpress.com/2020/06/magemujawegil.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007514.bin
f6b5ac5369d8166dc2c07bae2b7cb4a6f807514321f794ca68e569e48d1c5cfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7514 5048 bytes
font_01_sfnt_off00008648.bin
ac753e9290ca1fa87171cb1a0302a5f45573599f6887214a14a3eba0795b9c32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8648 9988 bytes

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