Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16b8f12341c85ac…

MALICIOUS

PDF

37.5 KB Created: 2020-08-23 00:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d5ec7efd86b858d13767c9113cff504 SHA-1: 265bd730128691df9e987a3bb5f5507a22629a8a SHA-256: b16b8f12341c85ac25eecefc7ebe91a5d809709503c2788d43342147a4e5193d
162 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 link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=addtype+application%252F+octet-+stream.+pdf'. The document body also contains a large number of URLs, many pointing to Shopify domains, suggesting a link farm or content distribution network used for hosting malicious files. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=addtype+application%252F+octet-+stream.+pdf In PDF document text
    • http://bizurireb.jaymcclellan.com/uploads/1/3/2/7/132712358/xilowigupifuvodonep.pdfIn PDF document text
    • http://files.christianfellowshipgoldriver.com/uploads/1/3/0/9/130969772/ef4688ec71c22.pdfIn PDF document text
    • http://files.vocalrevz.org/uploads/1/3/1/3/131384436/8095307.pdfIn PDF document text
    • http://verizazor.elizabethlynn.net/uploads/1/3/1/3/131381762/1e06f8839de9351.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/1/0428/7827/1641/files/dawipolebibe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/lazesogiriwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6090/1528/files/unspeakable_acts_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/4008/8740/files/xitilogelor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/jerolalipi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/parliamentary_procedure_worksheet_activity_1._02._02.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/openssl_certification_authority.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/activate_windows_10_free.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_off00005671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5671 5492 bytes
SHA-256: f8f6e9cbd00363eb90065db1bef80ea96fff97001f16eb98dbb1e1933d2b80d4
font_01_sfnt_off0000691c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x691C 9460 bytes
SHA-256: b04ecc31c48318216d2aa4bc751a66d496097e14659c287bfff6cd67029d621b

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