Malicious PDF — malware analysis report

Static analysis result for SHA-256 be49b4545b9a9a25…

MALICIOUS

PDF

49.0 KB Created: 2020-09-05 13:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 392514cae98f1a3ce470f39fe83ec4bb SHA-1: 4a10356eee754057a874b60dfdb87062cf9c09c9 SHA-256: be49b4545b9a9a2563b4de46ea25984b5a6eb5927b56c85ee6cd381db6d67c45
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL, indicating a phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains the malicious URL and text suggesting a lure for a 'learn japanese app free'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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.link/wix?keyword=learn+japanese+app+free
    • https://cdn.shopify.com/s/files/1/0433/0743/4142/files/84023579297.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1087/files/gaxab.pdf
    • https://cdn.shopify.com/s/files/1/0433/6379/5096/files/bastille_pompeii_song.pdf
    • https://static.usrfiles.com/ugd/2ddd39_6df11293ea024d1da44340d2d8ac5d8b.pdf
    • https://static.usrfiles.com/ugd/1f5cef_1030f8e1189f4e008363a0463d4847b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_96fd505f73ce4c528ffd0cc23ef824c5.pdf
    • https://static.usrfiles.com/ugd/8a9bcc_deb1e9d1ce3e42279aee0414e3c626ca.pdf
    • https://static.usrfiles.com/ugd/7c3584_d77344b5d7914295b503f3dc3ce1020e.pdf
    • https://static.usrfiles.com/ugd/8e1900_22beacd545674325b2d012f465580f44.pdf
    • https://static.usrfiles.com/ugd/b7082a_b6b4bb43b700426f9e2b40462486d488.pdf
    • https://static.usrfiles.com/ugd/8ba634_16234551d1e0461eaf6cbac0dddf78ef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078c3.bin
2186a19ed17a9c19a4f24a2028f60013067f3e726c3c1c26daba062e0b0f5b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C3 4880 bytes
font_01_sfnt_off00008974.bin
23b1d8637a2e9fecacbc468bda83b90d2a2b5e1c212466c313aeeb0bbf7f4377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8974 14468 bytes

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