Malicious PDF — malware analysis report

Static analysis result for SHA-256 7776680d8403f9ee…

MALICIOUS

PDF

58.4 KB Created: 2020-07-15 13:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6623bdb1bcfa1829592399becfc02bb1 SHA-1: 3540299cb4cc551f85b53357bddf4d2f2e5c0d65 SHA-256: 7776680d8403f9ee43a7fbf6ece46e78654289ac372cb8a810a3b75e75a05a22
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to medical information. The ML classifier strongly indicates maliciousness, and the presence of multiple external links suggests an attempt to drive traffic to potentially 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.cc/wb?keyword=anesthetic%20management%20of%20pheochromocytoma%20pdf
    • http://files.moments-heartgifts.com/uploads/1/3/0/8/130815124/4835219.pdf
    • http://files.wisdombytheletter.com/uploads/1/3/0/8/130814337/4079693.pdf
    • http://files.centralcocfamily.com/uploads/1/3/1/4/131438150/6245733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapitawaluzosamorexub.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/18672680519.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/45450379966.pdf
    • https://jutoripe.files.wordpress.com/2020/07/59353697760.pdf
    • https://luxuvolug.files.wordpress.com/2020/07/vuxomejetowafelim.pdf
    • https://bupuluz856263956.files.wordpress.com/2020/07/kobufu.pdf
    • https://bepakarotoj.files.wordpress.com/2020/06/18262697281.pdf
    • https://supofelusipi.files.wordpress.com/2020/07/dimev.pdf
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/xopomifekupalibalopopo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/3475599540.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/86935497876.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1317992411.pdf
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/54870714944.pdf
    • https://cdn.shopify.com/s/files/1/0429/1962/4870/files/rukexuvorudijili.pdf
    • https://cdn.shopify.com/s/files/1/0430/2723/4969/files/22762770805.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_off0000a3b9.bin
c21ca160eecc51d91cb45d51e976adcf82bb7891c932ff6cd64a445962f67c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3B9 5416 bytes
font_01_sfnt_off0000b5f7.bin
fc874f5e10dcb2cccf92a17efddf1c8efe5294973dae9715d2646e856946e39f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 11676 bytes

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