Malicious PDF — malware analysis report

Static analysis result for SHA-256 05212f36bb628be2…

MALICIOUS

PDF

41.5 KB Created: 2020-08-06 10:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b32e44d7fb13e283273707d2735f815 SHA-1: 30f91ace31d49bebec0210d1ea02133aea60a605 SHA-256: 05212f36bb628be26314460d6c4b0914d9e37bdc5a95eb30cc5a3a74ff708252
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=bleak+house+online+pdf'. Another critical heuristic identified this as a PDF link farm, suggesting an attempt to generate traffic or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. While no scripts were explicitly extracted, the structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

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.com/pify?keyword=bleak+house+online+pdf
    • http://files.cosmexmelbourne.com/uploads/1/3/2/8/132815968/b142704a9.pdf
    • http://kenuko.healthplexfamilyclinic.com/uploads/1/3/1/3/131398428/2399827.pdf
    • http://files.sky2000.co/uploads/1/3/1/6/131606563/zemekelan_rorivuzewizoz.pdf
    • http://files.andersonboergoats.com/uploads/1/3/2/7/132712451/3792799.pdf
    • http://files.odera.net/uploads/1/3/0/7/130776661/7274924.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1865/7703/files/22365541886.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/48160913608.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ralaguguzovepusumizus.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7618/files/nordic_trac_a2550.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85755015361.pdf
    • https://cdn.shopify.com/s/files/1/0434/9313/0390/files/76587640922.pdf
    • https://cdn.shopify.com/s/files/1/0436/5503/7078/files/waxamikol.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/xabutajanifejozesipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6511/files/kajoxuxupunadaxob.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/90485196944.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/federal_financial_aid_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/0282/9734/files/business_analyst_sample_resume.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006494.bin
89bd19d502301c265b360b611c16318c486b072992ba6a2491a81e8d556a8788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6494 5148 bytes
font_01_sfnt_off0000761a.bin
613b24a8ffa647dfd80fb22c6189d5fc154da60967fdebefb73dcf894b53d62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761A 10272 bytes

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