Malicious PDF — malware analysis report

Static analysis result for SHA-256 79109e737257de48…

MALICIOUS

PDF

53.5 KB Created: 2020-08-08 09:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcf805f2ca2071cc95cab0da0d5e1013 SHA-1: 70c4c9ad31d7403a8547d33ac78929d8096557ec SHA-256: 79109e737257de489cf62e98c8315bea070f73a39566a5509ae7a9229c6ab727
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to drive traffic to potentially malicious content. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL supports a phishing or scam attack pattern.

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.cc/pify?keyword=prevencion+de+cancer+de+mama+pdf+imss
    • http://files.economicsuniverse.com/uploads/1/3/1/6/131637218/pexiwipomesiwanuvina.pdf
    • http://rivopez.hiddencovelodge.com/uploads/1/3/0/9/130969060/6267475.pdf
    • http://sifado.beatsbayarea.com/uploads/1/3/0/9/130969723/sojaluvonof_popaz_gipubutofoxepot_wopadujuleb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7314/9859/files/70872921167.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/64179693083.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/27935001088.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/mejonojosolaje.pdf
    • https://cdn.shopify.com/s/files/1/0437/3577/7445/files/wuripefitudimepigad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/38956801613.pdf
    • https://cdn.shopify.com/s/files/1/0435/4591/9652/files/babuwomidilevad.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/wobajakixutikijikil.pdf
    • https://cdn.shopify.com/s/files/1/0430/6701/5329/files/82404591532.pdf
    • https://cdn.shopify.com/s/files/1/0439/1917/9931/files/nefajevunesa.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/motorguide_trolling_motor_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/b_j_thomas_advanced_vocabulary_and_idiom_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/zizofasejowenegakiba.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_off00008e99.bin
0e9d8c093f7920997228f6bca852a70b007e0d67252d98847607d531661d6e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E99 5328 bytes
font_01_sfnt_off0000a0ab.bin
97f7eb4e1308e0a66acfcc63f9104608f10c95057619069f55d1c61f303ede5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0AB 12452 bytes

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