Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c2df457b6435f5…

MALICIOUS

PDF

33.5 KB Created: 2020-08-31 05:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a4abb1c1a7e1a8e0019fe4cb7de66b44 SHA-1: f54ebb372f09666f6389da4c50043661b1778d37 SHA-256: 67c2df457b6435f52dc60d25ae6e1a6fe5a257e36615aef5e1fcc5f082045cd1
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, appears to contain keywords related to educational materials, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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.com/wix?keyword=pance+prep+pearls+3rd+edition In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/chromecast_for_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2178/6521/files/totijatavudajexapuvixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/zojugebovojeveniwuzesamu.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/73f3b0_6d0c434a39194701894b1d11ca3869dc.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1bb2aa7339834f3a8358bd9568f5b3e9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9209/8726/files/prevention_of_greenhouse_effect.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1595/4847/files/92799525008.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9460/5975/files/sagasawuvuvigotugere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0569/7438/files/44932580728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9249/9868/files/berker_serie_1930.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4539 5232 bytes
SHA-256: 934f57dbeff2a2711efd7f8e1ac89407e4d346c4a126f7771829b4c4d65424ea
font_01_sfnt_off00005705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5705 10152 bytes
SHA-256: 502d723940e62da2b7b807ab039a7901112e36537ad0c5a99a1599b70d003bcc

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