Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a87f88866033c2…

MALICIOUS

PDF

43.4 KB Created: 2020-10-28 11:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cfaf0aab0a3287b30dd78c52eb97aa45 SHA-1: 325844e63ee4942db594d5d920ff8a6053967684 SHA-256: d5a87f88866033c2fb82c7017678243d0003bd186824e04dc444c0fbd84e0911
184 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. One prominent link, 'https://ttraff.link/123?keyword=deep+blackhead+removal+on+chest', suggests a deceptive lure related to health or beauty. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to potentially harmful sites supports this assessment.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/123?keyword=deep+blackhead+removal+on+chest In PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/wafok-mofiw-rorazixa.pdfIn PDF document text
    • https://xepajozojiv.weebly.com/uploads/1/3/4/4/134476610/5441692.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/13299eaab9a.pdfIn PDF document text
    • https://nosekuge.weebly.com/uploads/1/3/2/7/132740467/2022595.pdfIn PDF document text
    • https://buxipowuno.weebly.com/uploads/1/3/4/3/134353207/bupawof-kaxiwexir-rabajebatofelun.pdfIn 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/4514dd4c-0e05-427d-b254-061bee74a9b9/tekken_full_movie_2010_in_hindi_dubb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/308ed669-d8ca-4cfc-a95f-ec3dd2b4bb55/akira_kirie_toroimen_no_shirabe_down.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8340/2909/files/physical_activity_pyramid_yoga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8494/6850/files/rukidolod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4386/2693/files/the_dark_net_book_jamie_bartlett.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/pet_care_merit_badge_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/synonyms_words_for_ielts_reading.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/angle_of_friction_and_angle_of_repose.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/wiminabagalifu.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/arduino_starter_kit_multi-_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199540d8-5478-4f5f-b518-b5329488a460/46059817122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74fcc926-bf05-40f6-9e7c-d7fbdeab013f/nikon_d810_manual_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fceb8542-d4c9-4633-9874-d63920321deb/jaberefopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3125/2120/files/70425892358.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/92196996925.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_off000069f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F2 5576 bytes
SHA-256: 6e936d839a719f1f555443818a025cf0a2e4003df826f12157f59e20f9d7f39f
font_01_sfnt_off00007cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC0 10428 bytes
SHA-256: 61c24de9064216bd2b08aeca4b8afeef9dad5eddb73bdd636d30896027456057