Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae3894f81dab191…

MALICIOUS

PDF

46.5 KB Created: 2020-08-30 23:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2baa64fdd5556f78a7358f3705c8d3 SHA-1: de4a4c0964bc3442b773184e6ec5d0ae9edc1b67 SHA-256: 0ae3894f81dab191bb1c45d6a290f81912ec48ef4d5d8bcf851313c65b45c345
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, with one specifically pointing to a redirector. The presence of numerous embedded links, including one to a potentially malicious redirector, suggests an attempt to direct users to harmful sites, likely for phishing or malware distribution.

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.ru/wix?keyword=girls+frontline+arctic+warfare
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/4017/0406/files/jomejojes.pdf
    • https://cdn.shopify.com/s/files/1/0438/7838/3771/files/harvard_referencing_format_generator.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/synchronous_and_asynchronous_communication.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/47481802770.pdf
    • https://static.usrfiles.com/ugd/b8c837_f94ba408e5774401aeaaa9c15923d862.pdf
    • https://static.usrfiles.com/ugd/6d59ab_32540b68c829463fa1bf2395ea0add75.pdf
    • https://static.usrfiles.com/ugd/de65f7_26fd95a5320d4a9fb9c7eeb7ea994176.pdf
    • https://static.usrfiles.com/ugd/739437_22dcdd68aef3431cb78a61dc3a63dab5.pdf
    • https://static.usrfiles.com/ugd/e5a943_748441f2eea84fc3af721ccdf0fb8c23.pdf
    • https://static.usrfiles.com/ugd/38bf1f_ff88774d15824ebca29dff379f133e48.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab8d139f16d40d2aa89387052243d87.pdf
    • https://static.usrfiles.com/ugd/5de1df_14caf20d9f46419e90356bc8d9648208.pdf
    • https://static.usrfiles.com/ugd/64d889_a5b12d3bea7c42a888368c5dc5a3f880.pdf
    • https://static.usrfiles.com/ugd/b8c837_01f2fd2444b2434586ba0b0969919ead.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c8f.bin
a27409e3d20c10e7d9a4237dc93f403df4b95c79e3c8c4fdd981c3041b77f89f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8F 4784 bytes
font_01_sfnt_off00007cea.bin
016083e047f0956c0c0aae06b92146300c89b06e774f935b17633cb33a94e7ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEA 9832 bytes
font_02_sfnt_off00009e82.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E82 4324 bytes

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