Malicious PDF — malware analysis report

Static analysis result for SHA-256 4292663c4ceabda8…

MALICIOUS

PDF

35.0 KB Created: 2020-08-23 05:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 139d0b14949b32b9d2cc9bca14e70398 SHA-1: 9affbe2e772a15e0c7803f62bd2050ef95ec60ff SHA-256: 4292663c4ceabda8304cb9dc1319ad5d66ceef169cc27265a4e8af3af2a3cd16
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to Shopify domains hosting other PDF files. However, one critical link redirects to 'ttraff.com', a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for users searching for medical information.

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=angiomas+cavernosos+cerebrales+pdf
    • http://teleki.bedfordbiblechurch.com/uploads/1/3/1/8/131857252/ea8b0.pdf
    • http://files.emiliaskincare.com/uploads/1/3/1/3/131380485/kinusiwi_gejino_movodo_rubutagenuvokov.pdf
    • http://files.amorajstudios.com/uploads/1/3/0/7/130739154/cc081a4f.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/duwabumavoz.pdf
    • https://cdn.shopify.com/s/files/1/0445/3584/0932/files/i_ching_wilhelm.pdf
    • https://cdn.shopify.com/s/files/1/0429/9970/9855/files/sanford_guide_antimicrobial_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/90111922617.pdf
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/saved_passwords_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/valley_girl_2018_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/71701343712.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_off0000477e.bin
c9b844c3cc817f6f1f160d3eb0aa5dc9be2819617aabc219b906ee5f8a96732a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x477E 5664 bytes
font_01_sfnt_off00005a9d.bin
3bb4f7977c75cf1a66acd6c26d2a73083fbcf29f7cc30a78107bf2ff376f06a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9D 10784 bytes

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