Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1c1b65fd83b7ac…

MALICIOUS

PDF

54.6 KB Created: 2020-08-11 16:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4514974cb8e335cdabe8af1f4c81c60 SHA-1: 7e4ed594c090b24ed34851c6f07b766ade32e0d7 SHA-256: 0f1c1b65fd83b7ac3c8f882be73789f02cdc4bd62056b386d3e5cfaaaa983a61
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common technique for distributing malicious payloads. The document body also contains numerous links to other PDFs, suggesting a link farm designed to improve search engine ranking for deceptive download lures. While no scripts were explicitly extracted, the presence of a malicious redirector and the link farm strongly indicate an intent to lead the user to download further malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=synonyms+and+antonyms+pdf+free+download
    • http://files.light-surfboards.com/uploads/1/3/0/9/130969761/2448896.pdf
    • http://files.miyoshiheita.com/uploads/1/3/0/7/130775746/7c37ae6783.pdf
    • http://files.repeatinitiative.org/uploads/1/3/1/3/131379231/buvizuzokutesaxi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6296/0023/files/3372184711.pdf
    • https://cdn.shopify.com/s/files/1/0433/1402/0507/files/lojunewotirijamifebufefo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/51535251892.pdf
    • https://cdn.shopify.com/s/files/1/0437/4754/1146/files/damien_rice_albums.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9469/files/xijixujiti.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7303/files/books_about_love_and_life.pdf
    • https://cdn.shopify.com/s/files/1/0429/0917/1879/files/94794791210.pdf
    • https://cdn.shopify.com/s/files/1/0439/7904/7070/files/lukogomubonerijedirubik.pdf
    • https://cdn.shopify.com/s/files/1/0436/6296/6937/files/90366969319.pdf
    • https://cdn.shopify.com/s/files/1/0432/7761/5270/files/dadevidunemusib.pdf
    • https://cdn.shopify.com/s/files/1/0448/5450/9729/files/chinese_to_english_translator_online.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_off00009352.bin
2acc17ae5567362f924b17506de07fd7bbb6919a8982eaafafe5497218720639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9352 5484 bytes
font_01_sfnt_off0000a5f3.bin
c34837e2d20a0493d5aa8931ace222d74d5c15890f61fbba2e6a78fd6ae8869d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F3 12588 bytes

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