Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddca9928d8c5c61…

MALICIOUS

PDF

57.5 KB Created: 2020-11-03 02:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dd5f2a8d68e35cd24710a2233dd3b9bc SHA-1: 94ba8bff76ea5dd67f60d9009dec14dd558cef1f SHA-256: fddca9928d8c5c61af3616d5e28e052e2730cfda8504fb31284fcfb797d72650
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lure users to malicious websites. The document body, though heavily obfuscated, contains text that appears to be related to a game, likely as a lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://cctraff.ru/pify?keyword=granny+the+game+unblocked+at+school 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/62ce4e4a-e117-4256-b12a-30d3e56cf8bc/zaxaguzafimefurinabap.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/centinel_1.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/amoeboid_tapetum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bafce1a-4beb-41ea-bd4b-b4abd043fb88/tuile_photovoltaique_saint_gobain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2289cff4-75ab-4639-aca4-daf2bb96bd6f/nolobuvirusok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec1060f-2539-4bd3-a235-8d612c983168/42339517018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dd1645-3b08-439d-96a8-d9a2cf320504/85173166769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f52c953d-6f78-430b-92e0-78c50a78733f/ninajotizebipukas.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/alvarado_score_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/chrome_apk_android_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f33146a-76d8-4350-909e-5bc297480e15/58876417959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c64ba29-2fcd-45b4-a5ac-939eaf2c4b8d/positive_action_words_that_start_with_u.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000719d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x719D 16208 bytes
SHA-256: 4a19a8798cf9c19175ea207b959497e4b7cb2dcda20a470f9603576897619bf9
font_01_sfnt_off0000a22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA22B 5692 bytes
SHA-256: 136edd0a396fb69ffec1e39b51b61a0d6e543102ecc46f1a04533e0585783d85
font_02_sfnt_off0000b562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB562 10232 bytes
SHA-256: 7d9aeb09c83ad956233fbe93528f75ab3c03c6d04d77b97bf7fcd421a88037a7

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