Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda9ec312db6a6b1…

MALICIOUS

PDF

49.5 KB Created: 2020-11-03 09:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a7e03fcf0e5a124ec8952bd1c0a6a76d SHA-1: 1997b95a2e5b37e7c0b528c546be95de0415a392 SHA-256: dda9ec312db6a6b134c34d041e7b3027c31dfd28d1d9ca21657417ef52f02c85
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/123?keyword=college+cheer+clinics+2020, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'college cheer clinics 2020' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, further supporting a link farm or spamming operation.

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.cc/123?keyword=college+cheer+clinics+2020 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/94187567833.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/china_population_control_pros_and_cons.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/27447161245.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/6153575902.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8534/1892/files/15466348089.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/a_an_the_article_rules_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df20e7f-7807-416d-8350-44812dc1337d/farmington_ct_police_department.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/business_model_canvas_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/xuberivubigemigobadarineg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb847374-002a-4555-943a-3418963c6cf8/2002_lexus_ls430_repair_manual.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_off0000836c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836C 5028 bytes
SHA-256: 3f8487be65169ed2a28f434d67712cbabd86d4867cc33bdcdf5ac789111a5322
font_01_sfnt_off00009487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9487 10920 bytes
SHA-256: 50651632b2ebc01e73e893243f2632fe94b90e6c6265e4a3595fa3e0474fa138

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