Malicious PDF — malware analysis report

Static analysis result for SHA-256 696a6d51ad19f6df…

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 19:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10be08710be7aea33c8beac7f140e3d6 SHA-1: e062c12e8fab3f157d665ac89a317e61d957e087 SHA-256: 696a6d51ad19f6df6c8cbe265b923046fe0860a1a3f193840fca88866345484b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits. The document body itself is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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=blur+background+android+example
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/98e298_bf365cc2ecec42739d0bac69a1d18024.pdf
    • https://static.usrfiles.com/ugd/4b874d_3d1766e343df4337adab9751e11d65c3.pdf
    • https://static.usrfiles.com/ugd/ab059d_b7ef02e8ef784b14a3062ade6893ada7.pdf
    • https://static.usrfiles.com/ugd/badafb_9afdfd939f054bafad999fc27ca11717.pdf
    • https://static.usrfiles.com/ugd/9904c2_748d4d0045fa42a8800ee23ab1474b55.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_a7973772c3764a9491dfd2510dbd1e1b.pdf
    • https://static.usrfiles.com/ugd/80c1db_998411814ec64aaebe7d43d8cffef0bd.pdf
    • https://static.usrfiles.com/ugd/a107db_aa9f353501c84f3d957301b9c0eb69a9.pdf
    • https://static.usrfiles.com/ugd/73f3b0_1923fa34cc3b4b5ab0625623235188a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_0033ea4452db4d5b989bf92049294be2.pdf
    • https://static.usrfiles.com/ugd/df4650_40d3b5e8f9d9496284a8d8068624ac7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7158018ce86b44ffa626a76abc9a9b06.pdf
    • https://static.usrfiles.com/ugd/b8c837_172d42e92ff247ad86fd322153d4e154.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_off00005f0c.bin
aa13f15f7d647bafad56360dcb342da427cffb997b61df75ef4298a4d7ef6024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0C 5536 bytes
font_01_sfnt_off000071ce.bin
0592abf615c8233175a1b2bdbfdcc37c7189bf2a81ad05974cbefdeea37ca1fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 10208 bytes

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