Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb474146ade2310…

MALICIOUS

PDF

91.8 KB Created: 2020-11-02 01:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a0d4e86300f92bb41eca58fd0d78bd61 SHA-1: 92c10dd5e0262cc9748586e2266f3840e07208dd SHA-256: 1cb474146ade2310f3d31a52783b387d0f1e8458398da3d30cb599f90ca248db
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL https://ttraff.cc/123?keyword=pembroke+elementary+school+vb. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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.cc/123?keyword=pembroke+elementary+school+vb In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f99795a9e10e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410953/normal_5f94723334d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_5f9a97f470962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_5f9baa28ef094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f9f3f842608d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5f9ebbe42e1fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8729b2e0097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f8d70741d897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5f8eab601ff94.pdfIn PDF document text
    • http://www.opentle.orgIn 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/80c2db8a-0dc9-4c37-ac1b-eb835dcbc3d0/hvordan_man_laver_juleklokker_derhje.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/57686002747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29eed47-1775-4a02-8e36-37066aa455d0/69787961315.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3551/9895/files/zero_g_datafile_volume_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec97d5fd-989d-4401-ab9f-4f1c0c732b73/29475636822.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/fukirib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe61caf1-df10-431d-8dc4-b8b026ca5842/86315236972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf7460a-0cf4-49bb-823e-dabbd79de4e9/attack_on_titan_torrent.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010b2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B2C 18460 bytes
SHA-256: b0d850ffee1232da542ca88cbae50d920628f6b5bf97cd6ddce2bea2ce09ce42
font_00_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 5404 bytes
SHA-256: a69494e5964de64184dc1cbaba73b34f4687e954254f44d98f1baf78397aa23d
font_02_sfnt_off00013c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C44 11080 bytes
SHA-256: 4ff5c4fbce60e825272ce460ab1c2124a1df562f816d2e764d3fae94111c7da6

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