Malicious PDF — malware analysis report

Static analysis result for SHA-256 4916f6ca7cc97824…

MALICIOUS

PDF

68.5 KB Created: 2020-10-26 18:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: eca24a406d5436fa15bf5a7e509d2651 SHA-1: d0a89a7f740cf571883db64e49a69a0cb7a1b5f8 SHA-256: 4916f6ca7cc97824afd3261cc4f2545c8dc31824d2249de986516bd3b8e1d05e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/pify?keyword=pre+op+instructions+for+hysterectomy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8934a61a60f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5f954f71ae9fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f8e9457bf7a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f95f2a9d6dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370530/normal_5f907565c3722.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/voziguna.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/zawozi-jojofozunu-jotolelexe-pulupukalisef.pdfIn PDF document text
    • https://sopulekazixov.weebly.com/uploads/1/3/0/7/130776801/sapuganivedupadokuri.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/913438.pdfIn PDF document text
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/lizozibutijefizo.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/1/0479/5118/4028/files/ranofenivotevujemebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4322/3209/files/36842910750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2781/1485/files/tuwizudum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4013/6601/files/air_wings_game_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8660/1120/files/turkey_run_inner_tubing.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/sociolinguistics_by_hudson_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f00049e-4afb-49cf-a4f0-b8e4d88eab0e/4540135993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e9afa0-948f-4191-ac37-e7f8cf057d41/77176003884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a63cee-27b0-4333-9c56-2b93f512a964/wimivilitixetarafukazuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4594ee-222d-4884-917c-4e89f788c71e/wizamasu.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_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 5116 bytes
SHA-256: 106d3158b245db80b232c7c5aab9149d996093a7dee032bf3c4202842a757e8e
font_01_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 10996 bytes
SHA-256: 4e6e287dbd5ab4409f90a6d3a3455f3f098665d6e116d6e78123e2d59da7cc0e

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