Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6afdeaf4c23ff4…

MALICIOUS

PDF

107.3 KB Created: 2020-10-02 07:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5ab520cad6416b2354ac94c4d518359e SHA-1: 717c291784427d2a41c938d7f52cf189b86c4385 SHA-256: 8d6afdeaf4c23ff4f05f63d1f273dde7016c017ec3795617cdb397b6ee072597
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with a search query. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains the target URL. The presence of multiple disposable hosting links further supports a malicious intent to distribute 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/pify?keyword=7+bit+ascii+table+pdf In PDF document text
    • https://site-1037074.mozfiles.com/files/1037074/turuvewanifowijimikewej.pdfIn PDF document text
    • https://site-1036711.mozfiles.com/files/1036711/nemumivaxe.pdfIn PDF document text
    • https://site-1038547.mozfiles.com/files/1038547/parowopunibofibar.pdfIn PDF document text
    • https://site-1036929.mozfiles.com/files/1036929/35882454911.pdfIn PDF document text
    • https://site-1037149.mozfiles.com/files/1037149/48777547936.pdfIn PDF document text
    • https://site-1041676.mozfiles.com/files/1041676/gobajajupivi.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/guwuxexo.pdfIn PDF document text
    • https://site-1036960.mozfiles.com/files/1036960/sugefejulomegokeboxidok.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/fujitonop.pdfIn PDF document text
    • https://site-1038555.mozfiles.com/files/1038555/71184593700.pdfIn PDF document text
    • https://site-1038467.mozfiles.com/files/1038467/pisifusivene.pdfIn 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/1/0435/5879/7471/files/habits_of_a_scholar_video.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3087/2215/files/96287244606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7369/4613/files/75579130872.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269A 5180 bytes
SHA-256: b88006f8abf8b97d3b1318314863af79a23f648452dc2e7ec6813ec0aabf4aaf
font_01_sfnt_off0001384d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384D 16784 bytes
SHA-256: 99a01369fdd8f272454eac4f74fe24a2ea225cc21303bdef256734e4c86d2238
font_02_sfnt_off00016dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC6 16200 bytes
SHA-256: dd8a01d90701d8c526b8b1392db5416ae5d05341aab0cdd5840b3a76f460e31d
font_03_sfnt_off00018301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18301 13500 bytes
SHA-256: 510355346430ee388cc9456cbc8daa03e1972a4662ea49a0ad5c13c14a537ac6

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