Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f72fa8f8df94f5b…

MALICIOUS

PDF

50.4 KB Created: 2020-09-01 04:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26fdcbc053da3b76db757296450cccde SHA-1: 9b80aa1bfa73613e0de503a424baa93749b83e68 SHA-256: 6f72fa8f8df94f5bb28570b346fcdc7ac0738ae0de56e43bec92a770d161f9f5
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Chiari malformation treatment options' and a URL, suggesting a lure to a malicious website. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious nature of the file.

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=chiari+malformation+treatment+options
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e745be_1022f61908874345829858447dea74b4.pdf
    • https://static.usrfiles.com/ugd/77eba6_b67542aa553f497bb427017ecfd5373c.pdf
    • https://static.usrfiles.com/ugd/c7a620_6b2dd98e816e41c8a219a3c342b35043.pdf
    • https://static.usrfiles.com/ugd/764aaa_4a024fdeaa2b494cae7df0fc00f19340.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/35660702955.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/74596027241.pdf
    • https://cdn.shopify.com/s/files/1/0429/7742/7609/files/dipimixiwunodezexati.pdf
    • https://cdn.shopify.com/s/files/1/0437/6510/4791/files/nunafu.pdf
    • https://static.usrfiles.com/ugd/ea2f88_a032a29f3d2243aaa33540eb481ca153.pdf
    • https://static.usrfiles.com/ugd/6116da_7c2f058392c94f63aa0aab3893328437.pdf
    • https://static.usrfiles.com/ugd/9b5f63_af5a789e80584a15a615bdce0efe758a.pdf
    • https://static.usrfiles.com/ugd/60933b_6d267702f5d74aca926a02632d3b1031.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/75851696600.pdf
    • https://cdn.shopify.com/s/files/1/0428/8747/9455/files/versailles_self_guided_tour.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0095/files/template_ppt_animasi_free.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_off00008873.bin
14bfef6be96bd5e3a4e4ca35c92278308968ee52fdb20ec089c8211d4d8c6a76
pdf-font-stream PDF embedded font (sfnt) at offset 0x8873 5044 bytes
font_01_sfnt_off0000996a.bin
6f12f47ee93c4475340968956966e87b591777032575c6f472040adbbce99a5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x996A 10468 bytes