Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0db4fb3bbaf253…

MALICIOUS

PDF

59.0 KB Created: 2020-11-05 10:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a653fb4616f3c081c3bed3d0be9fbefd SHA-1: 1667c3777a00270683655eb1f719d8382d5e5f5f SHA-256: fd0db4fb3bbaf253b21dadbf6329eb4b542ec0ecfc835c0b01695dd21ccfb591
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector, indicating it's designed to lead users to malicious infrastructure. The embedded document body text, though garbled, contains the URL 'https://gettraff.ru/strik?keyword=welcome+to+work+meme', reinforcing the lure. The presence of numerous embedded URLs suggests a phishing or social engineering attempt, likely delivered as a spearphishing attachment.

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/strik?keyword=welcome+to+work+meme In PDF document text
    • https://josafobuwevaj.weebly.com/uploads/1/3/4/4/134464642/kebelor.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/5582990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f8b990a0ae93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_5fa1998323e3b.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/lakadutof/fivoluwagutavitopot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d1807c-f66a-48f0-807e-5e622ae62098/how_to_uninstall_voicemod_voice_changer.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/10316671934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40f4acb-7751-4bde-858b-b2c33ca834b3/dipuxuxevavivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa816853-9456-429e-9be0-ec859e252897/pebojigelegogukuwutobejif.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/tixolodavewig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ac781a-b6cb-42be-840b-22b7dab8725e/is_download_mode_the_same_as_fastboo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd971954-7ef6-4d84-9e5f-a74f9ddee4a1/58123643456.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/arabic_alphabet_flash_cards.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B64 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off00007bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDE 4728 bytes
SHA-256: 8815933363d3535dcef2bcfa5654e3829f3f595cbb5af1126f2d72297f93d354
font_02_sfnt_off00008bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEA 7604 bytes
SHA-256: 50caaa8741c92276c07bdb723a60f246aa78b72bc0d08590c963fa7da989bd60
font_03_sfnt_off0000a135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA135 11136 bytes
SHA-256: 19887ad18bf707f0a052ba27d579e1b2b7d2701e30119738ad2ba73255de1007
font_04_sfnt_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 16808 bytes
SHA-256: 6efb8f27891ae79e2d14123e2a2a4d69bfc628edfb02f621707b86118794e12c

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