Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce26f9505710237…

MALICIOUS

PDF

39.7 KB Created: 2020-10-31 11:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2d8d53b3c0e8c8fbb76b0e0e4ff4714d SHA-1: 3cf6853efd50ada160affd1b2b2a3b8ecb62e8ee SHA-256: bce26f95057102374195091ceabc6149bc91f9d56144ee1ac2a863365fe92b24
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign-looking PDFs hosted on cloud storage. However, one critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious objective. The document body, though heavily obfuscated, contains the keyword 'unblocked games 77 give up' and the malicious URL, suggesting a lure to a potentially harmful site. The ML classifier strongly indicated maliciousness.

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 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.
  • 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.ru/123?keyword=unblocked+games+77+give+up In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5378/8569/files/management_and_leadership_styles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd682c44-9db4-4a08-95af-2b67e574e0ab/cch_np_tin_in__hn_quc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a15774-38c8-4314-a68d-e4d4d6291d22/53977682238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d31aa11-f84e-4786-a6aa-1c872afd3139/une_et_mille_fois_cristian_castro_mp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd94872-975c-4258-b344-cd6c11f58fbb/xubedobawotilumimiwaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d6898b-6a9c-444d-a1e0-e0b3cc3098df/1229241774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ca2b14-5cd5-44e1-b2e8-05cdcd8c1e33/44897659714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5219bf-c091-42f2-b368-0fa13f81b55f/pusiketajomu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9359/7601/files/linear_homogeneous_recurrence_relation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3732/6997/files/xofiriwisebelukoxivunet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afff029-79f5-4118-bc2d-181ef5af303a/galaxy_s5_neo_sim_card_size.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/6122/0793/files/65215653493.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_off00005036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5036 5436 bytes
SHA-256: eb6bb9d2f17107f3f83804a14460ebd59dd03be3485bbbc3e63b58ed66976522
font_01_sfnt_off0000629f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629F 9840 bytes
SHA-256: 93a5db4f6092442cf749b6ec080648d2ec27dcbdd4aaae7b4992ea4d03cdf853
font_02_sfnt_off00008445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8445 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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