Malicious PDF — malware analysis report

Static analysis result for SHA-256 f915a44a8cd6f019…

MALICIOUS

PDF

46.9 KB Created: 2020-11-01 12:14:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 721bd814c1ceeea0e89eb278180a4832 SHA-1: 3861b537d167e9d24619f485031a172dfb8938ba SHA-256: f915a44a8cd6f019f6ae891e1fd9feb6780019d98e6a453f2ba92d36b7813db5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, including a known malicious redirector at 'https://ttraff.ru/123?keyword=what+is+a+distribution+map'. This suggests a phishing or link-farming attack designed to redirect users to malicious sites. 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.ru/123?keyword=what+is+a+distribution+map In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_5f87a4e6e7aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5f9a7957da01e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_5f99e9526ff1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5f8a451671be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5f8d4c039d605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f8b699fc4d1e.pdfIn PDF document text
    • https://dedodewoluxo.weebly.com/uploads/1/3/4/4/134402612/52a872c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418762/normal_5f9e1b51113e1.pdfIn PDF document text
    • https://nasijominazol.weebly.com/uploads/1/3/4/3/134366940/baxesu_malepafi.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/1/0498/4936/8743/files/saparemej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9582/5314/files/some_silver_nuggets_ni_no_kuni_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7670/4157/files/all_android_versions_and_features.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/what_is_social_marketing_concept.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/45989711622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c993e0-1f87-4a5d-be7f-f55bab378b3f/fable_3_all_dlc.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_off000079af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79AF 5320 bytes
SHA-256: a77437c2d6a5db62c27757290692508867b1407dcac7dbe5e835a09a67921263
font_01_sfnt_off00008b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9E 10200 bytes
SHA-256: c7847e1907035829d409eb26f13a73822e0105d30105f7ba93138f012218c5e9

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