Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02834ab660c8bf5…

MALICIOUS

PDF

51.4 KB Created: 2020-10-25 15:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: df2cd16983ca3da3c8f29ef3342ad653 SHA-1: 186dc6fc6f68dc4765343935443446b7438f104c SHA-256: e02834ab660c8bf5425d7f4e4a7042d984e6a008123d6e903bc80eef6fbc516a
192 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=manual+handling+nursing+course+perth In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5f9157d3e863b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f8d5c25cf159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f8a723a1348f.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/molabixaxekibi-fukanosabituf-sulumunovitadez.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/78cec0143bc714f.pdfIn PDF document text
    • https://sijoxedewi.weebly.com/uploads/1/3/4/3/134346210/ec34b9.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/8102170.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/5deed6631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_5f954ad5b37b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f95068a443b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f8e39c203fa1.pdfIn 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/1/0266/9087/9667/files/92414846749.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6545/3975/files/fevovawomoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2806/8005/files/pubigegeburim.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/fojewazefitegosela.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/the_history_of_computer_science.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/bacteriology_quiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5402/9720/files/clash_of_kings_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7718/2646/files/high_level_data_model.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7031 5224 bytes
SHA-256: 6617c772ac2f9c649f26889983956f34d6d2b2f1b587d2c9709933602f82a0aa
font_01_sfnt_off000081d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81D7 1892 bytes
SHA-256: c4ebf9374f183e0d06abff076368f9778f5420368af1f3cb29c6cd45b472c97f
font_02_sfnt_off00008af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF7 11292 bytes
SHA-256: 0b9cf574e6e53258ef3d5cfac8c49188872fcd3e5c264aa5a7792470f3f8fb89
font_03_sfnt_off0000b16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176