Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1c5c4b85bbf012…

MALICIOUS

PDF

44.8 KB Created: 2020-10-25 15:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 459d1e656ed570114f42afdc25857816 SHA-1: eb76b746e13f10ce6fa4a01c801d7f88c20d166a SHA-256: cf1c5c4b85bbf012619d191acf340761f846bc6ad246eb01e5ed04180edb5adf
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, includes the URL that the heuristic identified. This suggests the primary purpose is to redirect users to a malicious site, likely for phishing or malware distribution.

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 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://cctraff.ru/123?keyword=the+doctrines+of+the+bible+pdf In PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/tizimiperesuneseri.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/726970d67.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/ce1b23a0b10.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/eadac612.pdfIn PDF document text
    • https://letalisukom.weebly.com/uploads/1/3/4/3/134316231/99848.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/1/0498/3272/2599/files/temoxuxovemagenurux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4643/1637/files/simplification_maths_class_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/6280/8742/files/present_perfect_tense_ks2_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b2c6db-da1c-426c-874f-84a669b78154/53519352447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12b8325-1e76-4650-9c86-d4b0f69ca096/66357216897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f40c74-0ca0-4866-81d1-541bd530d77b/visulalaxojimumovugaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab46c02e-eb6d-4461-b53d-a56983ea69d0/kuziremudodapisise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de52f817-2c22-45e1-8649-d67ceca8f147/82313765361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ab7c6f-b25e-47c4-9f35-52c226619b68/wozirutofiboduzug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec80c53f-a62e-4e35-8406-bf307e61d467/conditional_1_and_2_english_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/96554273488.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/aviation_weather_services_book.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_off00007092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7092 5120 bytes
SHA-256: 6806f436a16c66d611e709ee5ed5f6ee80534cca9f69b16af2d3a9e9935b721a
font_01_sfnt_off000081ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EE 10580 bytes
SHA-256: 317e36222a12eec52eb8cc047d20463bbb4366e8a6fd38226bad4333e7a6dff2

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