Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a4c74ab5a45710…

MALICIOUS

PDF

40.5 KB Created: 2020-09-01 01:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffd8f333b42e77b747e13eab92298d2a SHA-1: 18d3068c929785e155a0bfd28b49449e9068f865 SHA-256: 61a4c74ab5a457106e09e37300af01bc0a37e0fa442fbc2f3b3a29640403f58c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a critical redirector URL, indicating a malicious intent to direct users to harmful content. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting a lure for users to download potentially malicious files. The ML classifier strongly supports the malicious verdict.

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=arabian+nights+easy+piano+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/zopuzunimigagalumoguw.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/19255914938.pdf
    • https://cdn.shopify.com/s/files/1/0461/9498/3075/files/21625926938.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1143/files/36816095116.pdf
    • https://static.usrfiles.com/ugd/41f880_4b0c5c0343fe40e1bead2ac7eee69ca2.pdf
    • https://static.usrfiles.com/ugd/912de2_0a4689185b5b454ab3ce8524f99e6a15.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_86b17f151d3f48dc97ce9cecf939f6dd.pdf
    • https://static.usrfiles.com/ugd/45fd81_d1f865377bfe4d8d97dea25b9137819c.pdf
    • https://static.usrfiles.com/ugd/73c254_9ab37a0366ba44a4864761c69870af39.pdf
    • https://static.usrfiles.com/ugd/5de1df_67268b7c949847589da4619d60103a6a.pdf
    • https://static.usrfiles.com/ugd/4479ed_571063b3b5854fb8a1cdc139afd23701.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006115.bin
7a173217a6ead303e629351741e88321e890b098e8e9f4698b46045eddcf3843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6115 5504 bytes
font_01_sfnt_off000073c8.bin
9257ec8eb9f3c90c26b68b0799ea3f8e6eff0e2bc45df71afa09fb54ad1c2f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C8 9896 bytes

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