Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c7816bc044b3ed…

MALICIOUS

PDF

49.1 KB Created: 2020-08-07 07:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d849b19c422e859288389aaeb19e60d2 SHA-1: d19b558e963551aed58d0b1c0cfab9646439ac87 SHA-256: 53c7816bc044b3edf2be08f9e2bb4128df7db310deb37a4697a96d69bdfd31f1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially obfuscated, includes the text 'New economy toeic 2020 pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to malicious infrastructure. The ML classifier also 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.com/pify?keyword=new+economy+toeic+2020+pdf
    • http://files.sethgangwer.com/uploads/1/3/1/3/131398385/650e101d9.pdf
    • http://files.amwellvalleyhounds.org/uploads/1/3/1/6/131606673/fovixiweb-sabukaviwofe.pdf
    • http://fanuwita.midwivesadvantage.com/uploads/1/3/0/8/130874254/834647d16.pdf
    • http://ropam.whitewarriorhealth.com/uploads/1/3/2/7/132710797/gimureru_wujoxor_gadafetik.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9504/files/66456509492.pdf
    • https://cdn.shopify.com/s/files/1/0429/3751/6191/files/wafetew.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/dazajagimeta.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/92813913149.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/attestation_sur_l_honneur_crous_campus_france.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/17410079139.pdf
    • https://cdn.shopify.com/s/files/1/0444/3540/7014/files/night_at_the_museum_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/2717849214.pdf
    • https://cdn.shopify.com/s/files/1/0433/6232/0536/files/36151864350.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84860081798.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4828/files/roneretodizuleni.pdf
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/ximepowupixigemot.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082e5.bin
fe746a7cefd4c1361d28513afe88b48b26eb9d950bc897f889de2b448520c9a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x82E5 5220 bytes
font_01_sfnt_off000094c8.bin
7eef0327e615dc39eaf3d9e20179a39125a42c2f8e260a2d6e4ad59ed5feea80
pdf-font-stream PDF embedded font (sfnt) at offset 0x94C8 10068 bytes