Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f2de0bd2b9d9e5…

MALICIOUS

PDF

39.4 KB Created: 2020-08-19 09:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4d9a9dc1b0f68b1839435183e5acea SHA-1: 5e0571c2e091500c1b5a23cbdbf19a2bf9e5c524 SHA-256: 19f2de0bd2b9d9e5c3cfd78cbfcee2e1b0212fb0a36a62778440452a574d5a7f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with many pointing to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.ru/pify?keyword=krakow+free+tour+guide, is identified as a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection and potentially SEO manipulation.

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/pify?keyword=krakow+free+tour+guide
    • http://files.abhdi.com/uploads/1/3/1/0/131071041/xelifagopebozopok.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/sajavufag.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/weezer_say_it_ain_t_so_chords.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/lymphatic_system.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2732/files/fitufuxisiwosuzebovar.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/temosesoxekunazosagena.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/dazuduvifomogizan.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/torofofe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/murez.pdf
    • https://cdn.shopify.com/s/files/1/0429/1998/5319/files/mifiwoxakenejiwizakupalum.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e20.bin
985c23d02607eea52d7521df335632e1ff9c688c4c364beaf9b5be41f552edeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E20 4988 bytes
font_01_sfnt_off00006f3a.bin
145893b7c0a9a04ad17d9d1df2bfd19dac57c1c21d4bd213e6ea065f7439d645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3A 10060 bytes

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