Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4d3f301db92c9b…

MALICIOUS

PDF

37.2 KB Created: 2020-07-10 20:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d791170fbc8a8e19ac828a3ce076caf SHA-1: 092023e3ddff601bd8d29e5bd9a26f9c63ac5ddd SHA-256: 9a4d3f301db92c9b89811c4b7baf0d88de3724a64d178b427919bcd07f1f28ff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, many of which point to redirector infrastructure. The document body text and embedded URLs suggest a lure related to downloading a book, which is a common tactic for SEO spam and malicious link distribution. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious 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.ru/pify?keyword=business+vocabulary+in+use+advanced+2nd+edition+pdf+download
    • http://files.pst4y.org/uploads/1/3/0/7/130738814/piwagitasesesuwatug.pdf
    • http://files.patsartstudio.com/uploads/1/3/0/7/130776481/pilov.pdf
    • http://files.countrysideanimalclinictooele.com/uploads/1/3/1/3/131380868/newufutuje.pdf
    • http://files.fresnonutritionsolutions.com/uploads/1/3/2/6/132683111/9806049.pdf
    • http://files.thenightshiftsquirrel.com/uploads/1/3/0/7/130739318/beb6366.pdf
    • http://files.thefunnythingaboutbreastcancer.com/uploads/1/3/1/8/131871720/kikij.pdf
    • http://files.officialhowardcharles.com/uploads/1/3/1/8/131856626/xewutibenubobo.pdf
    • https://porafofaj.files.wordpress.com/2020/07/werawake.pdf
    • https://tafajirif.files.wordpress.com/2020/07/85075343037.pdf
    • https://nojeviles.files.wordpress.com/2020/06/70902207692.pdf
    • https://gegiguwesaf.files.wordpress.com/2020/07/72947205358.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xanixiki.pdf
    • https://cdn.shopify.com/s/files/1/0429/1634/8057/files/tisutojawufidovexasobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pidepuwavulosetanujerepub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/riwemabosemuridaredexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/94378853967.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13170590630.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_off000052e2.bin
200a17364428e83cf7787e6714096bdd6b1b9d0a41cc3e8b6b320d952a7df44c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E2 5608 bytes
font_01_sfnt_off00006610.bin
497f75e635967b04a3077d100310ebe7e26d40312c35e19e691c7ca906901c74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6610 9772 bytes

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