Malicious PDF — malware analysis report

Static analysis result for SHA-256 744d5cb084dcb0f8…

MALICIOUS

PDF

48.4 KB Created: 2020-10-28 13:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 741bba818ee2c32e7125fcc9df8eb3da SHA-1: bcfb6f03df2040859d4fd368f9f81919b4700bc3 SHA-256: 744d5cb084dcb0f8582cd7bdc0d83a4db09ffb2cc3ec2f39bb025365f60dc265
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a manual, which is a common lure for phishing or malware distribution. The presence of numerous external PDF links further supports a link farm or redirection scheme.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?keyword=cen-tech+61593+manual 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/067fdf21-9ce2-4e2b-bccb-a0f44d372776/69984671704.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/oxford_textbook_of_clinical_pharmacology.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/71007851779.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/canon_m50_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/oxford_discover_1_student_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51dfd09c-7800-4eb1-939e-e2bb30caac84/77410905273.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/36183163744.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/kegakivag.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/arabic_to_english_translation_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/28252942914.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8596/4461/files/2000_nissan_frontier_manual_transmission_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/9162029983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b72d7f8a-d986-4f8d-aeaf-4de518dc95b2/funlux_security_camera_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/43785895131.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/ethnography_books.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/geodatabase_tutorial_arcgis_10._1.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/wijemem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a706cb8f-e31e-459f-be76-46bee587fea8/menotakuwaxebised.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7958/9823/files/arvest_mobile_banking_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/newopetusam/tumblr_network_page_themes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2983/7982/files/order_of_operations_puzzle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/architecture_gothique_et_pense_scolastique.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_off00007b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1A 5352 bytes
SHA-256: 3333317b2530aa8a5bc447e5d1e0cec8a0624e887a6b2389bfb1f2d6f3a345a5
font_01_sfnt_off00008d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D38 11652 bytes
SHA-256: 6218504ad6a11411226bac48e46d44e8c11ecd2a0151308d223bfa28895cbde8

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