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) First seen: 2020-09-04
MD5: 6623bdb1bcfa1829592399becfc02bb1 SHA-1: 3540299cb4cc551f85b53357bddf4d2f2e5c0d65 SHA-256: 7776680d8403f9ee43a7fbf6ece46e78654289ac372cb8a810a3b75e75a05a22
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on what appears to be a link farm designed to redirect users to malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL pointing to 'ttraff.cc', indicating a known malicious redirector. The ML classifier also strongly suggests maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.moments-heartgifts.com/uploads/1/3/0/8/130815124/4835219.pdfIn PDF document text
    • http://files.wisdombytheletter.com/uploads/1/3/0/8/130814337/4079693.pdfIn PDF document text
    • http://files.centralcocfamily.com/uploads/1/3/1/4/131438150/6245733.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapitawaluzosamorexub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/18672680519.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/45450379966.pdfIn PDF document text
    • https://jutoripe.files.wordpress.com/2020/07/59353697760.pdfIn PDF document text
    • https://luxuvolug.files.wordpress.com/2020/07/vuxomejetowafelim.pdfIn PDF document text
    • https://bupuluz856263956.files.wordpress.com/2020/07/kobufu.pdfIn PDF document text
    • https://bepakarotoj.files.wordpress.com/2020/06/18262697281.pdfIn PDF document text
    • https://supofelusipi.files.wordpress.com/2020/07/dimev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/xopomifekupalibalopopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/3475599540.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/86935497876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1317992411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4103/0293/files/54870714944.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1962/4870/files/rukexuvorudijili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2723/4969/files/22762770805.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3B9 5416 bytes
SHA-256: c21ca160eecc51d91cb45d51e976adcf82bb7891c932ff6cd64a445962f67c93
font_01_sfnt_off0000b5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 11676 bytes
SHA-256: fc874f5e10dcb2cccf92a17efddf1c8efe5294973dae9715d2646e856946e39f

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