Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8a23b70fe56557…

MALICIOUS

PDF

38.9 KB Created: 2020-08-11 02:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a111d290dbac775dda26e67aa43a68ae SHA-1: 8a8b2e4b61f076ce085e73c43ea9514f1d2e48ee SHA-256: 0b8a23b70fe565571259e3ed54113275652d366a26c9f59400480efd0641a695
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to manipulate search results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to 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.ru/pify?keyword=classification+of+matter+quiz+pdf
    • http://files.stefiecakesandtreats.com/uploads/1/3/0/8/130813111/dufiwabegawit.pdf
    • http://xixojem.newjerseyalmanac.com/uploads/1/3/1/3/131379730/tozamizaxele_nofelid_rixow.pdf
    • http://files.lousavage.com/uploads/1/3/1/8/131858791/7a9a527f89baa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3826/0898/files/63359916228.pdf
    • https://cdn.shopify.com/s/files/1/0435/6410/5886/files/82480496777.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/xuxepuwepebusalelek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5329/3469/files/cbse_syllabus_for_class_12_physics_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/musaparujutel.pdf
    • https://cdn.shopify.com/s/files/1/0434/1491/3191/files/wondershare_editor_ocr_serial.pdf
    • https://cdn.shopify.com/s/files/1/0439/3802/1544/files/37246397945.pdf
    • https://cdn.shopify.com/s/files/1/0433/2732/4310/files/9218768217.pdf
    • https://cdn.shopify.com/s/files/1/0428/2092/7655/files/58741166146.pdf
    • https://cdn.shopify.com/s/files/1/0433/1143/1838/files/bodyweight_training_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/captivating_john_eldredge_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/rivutazopadosuperub.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/20514879617.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_off00005981.bin
d19191608a9d7b90e5a109d9615625401258dc8da37dc0087060e08edac89c9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5981 5384 bytes
font_01_sfnt_off00006bb5.bin
58fb4a3a3ce4eb3df2f94aaf19b63df4a4564993c7dc70d2e27f0e34883e95c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB5 10224 bytes

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