Malicious PDF — malware analysis report

Static analysis result for SHA-256 e133db48f1b0a461…

MALICIOUS

PDF

53.5 KB Created: 2020-10-30 16:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9ac2a4c9f8e0148ed89c96d68f7d21d0 SHA-1: 2c0ae02a4cc22d7042163005b3a68b1297f05990 SHA-256: e133db48f1b0a461a881388e1cb5bf11fbd1597c4de440da2f86d6424a46b5ce
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/123?keyword=shakespeare+canon+definition'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 'https://s3.amazonaws.com/wilugugo/62111233554.pdf'. The presence of a 'download button' heuristic suggests a social engineering lure to encourage user interaction with these links. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/123?keyword=shakespeare+canon+definition In PDF document text
    • https://jivetigaforivuj.weebly.com/uploads/1/3/4/3/134350389/9743467.pdfIn PDF document text
    • https://tenagudewujuga.weebly.com/uploads/1/3/1/1/131164273/8557400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/62111233554.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7569/4492/files/guzidukesapotado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b2a927-504e-43af-ae5d-03ed4c89b33b/enzymes_and_cellular_regulation_answ.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7545/9992/files/vepozapemuvesemem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a367a5-1fa9-4a79-9af7-2fb4792c1d7a/jomaz.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/fuji_absolute_2.1_weight.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5723/1525/files/23492974316.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/xepunoxawajewad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/9207/2342/files/78303399553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1612/1252/files/wallpapers_for_android_goddess.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c387de-9387-41c6-88d8-dc723310a2f4/73767880289.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/convert_to_word_mac_os.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_off000092c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C6 5376 bytes
SHA-256: 1a96a2e8937ff1c91883df10db10728c71bef846e026773defa64741661bf780
font_01_sfnt_off0000a50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA50B 10676 bytes
SHA-256: 1aafbde5df35c3150272b9214baec45005f49cd2a9c749c6f18702f849dad686

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