Malicious PDF — malware analysis report

Static analysis result for SHA-256 57776357bd54db02…

MALICIOUS

PDF

40.9 KB Created: 2020-11-03 05:40:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c1d38f3987cce83d3edaedfb185a5f5f SHA-1: 7da11728f1a50c2808f358a60757a004918b38b7 SHA-256: 57776357bd54db0289f2f5bcf7a416ff034944872ae88de42a197a5129d28843
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text fragments and URLs that suggest a lure related to educational content, likely to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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.me/123?keyword=flvs+spanish+2+1.09+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e409b34-77fe-4086-b807-231afe26d878/besapusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6505d1e6-f037-48af-ba0e-42f11ed0a92d/deathtrap_ira_levin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91361bd-6ffd-40ba-bf5b-b2e65235e93c/jubawuruvatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4104/5145/files/math_116_umich_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/wuwafugebilosa.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/47786961287.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd84400-6842-48f6-95ea-d11a819e75e9/2008_club_car_precedent_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b556a12-0d68-4d2c-b75d-796df86b9ffa/rolobipibamanuben.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0509/4332/8443/files/duvop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff22b980-f235-4a01-a939-40d4319e2e47/20_time_project_ideas_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab51617-3670-4235-a2af-022640764660/xijazofugalesesatodo.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/14252814845.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2951/0324/files/lic_jeevan_labh_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e13eaa2-2aa5-46d2-9c20-f6d0187f882f/xusagawololesugajogosum.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_off000060fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60FE 5528 bytes
SHA-256: 7e7b1048c4b13dce6cc7dc53c274f6709bcdc067f57e21da02b8cac36e38e10c
font_01_sfnt_off000073e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E1 10280 bytes
SHA-256: 05dc9c870f69e42b0dd042732d1e416277dfaf9f65a46beac8f016f0a5e4e7e8

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