Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8b0acbbfe9f7d9…

MALICIOUS

PDF

42.6 KB Created: 2020-08-23 23:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e205ef16a4ac9a60e3036a1dd1ba36a2 SHA-1: 68062fa69143d5c6e39c6e9ba919a10c820aa44c SHA-256: fc8b0acbbfe9f7d94c68e01e8955fb896bf07fb94015b20c86a92c07b1a6063e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'CD cover design template free' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous Shopify links, while mostly benign, contributes to the SEO-like structure that often masks malicious intent.

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=cd+cover+design+template+free
    • http://files.cubscoutpack3526.org/uploads/1/3/1/3/131379732/56c25e.pdf
    • https://cdn.shopify.com/s/files/1/0431/4136/5922/files/massey_ferguson_180.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/paguxatijevoxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0506/7943/files/99681881012.pdf
    • https://cdn.shopify.com/s/files/1/0437/7290/3578/files/unity_2d_android_game_development_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0459/8684/0743/files/free_bedtime_stories_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6192/files/kunuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/2009_suzuki_gsr_600.pdf
    • https://cdn.shopify.com/s/files/1/0460/2216/4639/files/silabus_biologi_sma_kurikulum_2013.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9520/files/76821146451.pdf
    • https://cdn.shopify.com/s/files/1/0439/4919/5419/files/ejercicios_de_categorias_gramaticales_resueltos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e40.bin
54443740bd187054685a6c1f22056f4eeea1a07bbc4a1ae66ff8d95f28846e62
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E40 5440 bytes
font_01_sfnt_off000070aa.bin
2b17894289ef4ac549ca5ccbfe538e6ebde94701791c0542cba9a71f2d67f349
pdf-font-stream PDF embedded font (sfnt) at offset 0x70AA 2268 bytes
font_02_sfnt_off00007abd.bin
3daa8aa765687f86d2439a82cb3183bcfc4799c07914e453156155d8905bf4c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABD 10132 bytes