Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e22a34e5e0a1f5…

MALICIOUS

PDF

39.0 KB Created: 2020-11-03 22:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5b588cb7b997df6436c568c5f2322730 SHA-1: ae017bf3802fa057d47a031ee6264cfcb00ef9f8 SHA-256: 23e22a34e5e0a1f5a2a776962b1be33d0bdc4ddb977d6c36247901d1ebbc9b99
154 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are likely part of an SEO link farm designed to drive traffic to malicious redirectors. The primary URL identified, https://gettraff.ru/aws?keyword=precalculus+5th+edition+by+blitzer+free+pdf, is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to PDF downloads and the malicious URL, suggesting a lure to trick users into visiting these sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://gettraff.ru/aws?keyword=precalculus+5th+edition+by+blitzer+free+pdf In PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/zubezebarogala_masisemofo_kadag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f9a18193078a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f8d3e0e55d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_5f934082752ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5f91c4d3b1166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5f9964d83ee3f.pdfIn PDF document text
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/3599632.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vasagesorajirem/wilder_middle_school_bell_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/24797855446.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/dragon_ball_theme_party.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcdfbc3b-af87-45e9-ad71-af6cf129cbc0/55068800901.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_off00005916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5916 5660 bytes
SHA-256: c0bdc5b90e70ad1f55daf540398961cbf2c15973d1b081ad59e4fb2cee3a9c51
font_01_sfnt_off00006c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5B 10272 bytes
SHA-256: e2a57d3c0779c9da90b2411d73a63b880fcb861da8cf93787529499de1ec63af

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