Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c48873efbd54cb6…

MALICIOUS

PDF

46.5 KB Created: 2020-11-01 04:27:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 37204513eb2af6fe82de2bf1982383e0 SHA-1: 8a20339a8bc4a57cddbc873177a522d9ceb21c54 SHA-256: 4c48873efbd54cb615e2323651c50ff989a024d8d551675b7487af16c2396b25
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 external resources, and one specific link is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'tower defense apk mod latest' and a URL that aligns with the malicious redirector finding. This suggests the document is designed to trick users into visiting malicious websites, 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 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.me/123?keyword=tower+defense+apk+mod+latest In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_5f9284748a436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f8df09f56f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f88440c3cae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446772/normal_5f9de078af062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8776ba81168.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/1/0498/8924/7399/files/90681711509.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9638/9828/files/track_my_android_phone_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656958a7-1e1f-4148-9294-92b0394bac75/fred_alan_wolf_parallel_universes_pd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5321/9479/files/mm_super_patcher_2.1_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5298/5251/files/inogen_one_g3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55a7924-5e1f-483f-bd4e-00a4ff5829cf/craftsman_multimeter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/lawuriraf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6296 5292 bytes
SHA-256: d36cada4b7a072c43608875b435c2fa69c6c33c2ee540a36dae8ae2410623b67
font_01_sfnt_off00007498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7498 10388 bytes
SHA-256: 95609245731ebddcd35a069d8513dfec6ab83e4e638ead4573eaab3fda9b5f58
font_02_sfnt_off0000986b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x986B 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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