Malicious PDF — malware analysis report

Static analysis result for SHA-256 0345c56b48a2fce6…

MALICIOUS

PDF

43.5 KB Created: 2020-08-14 09:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81e9e19285199ee66e464676d562ceac SHA-1: 065ea61906f35a668774ffcb9cc0379cd29d5dd0 SHA-256: 0345c56b48a2fce6ed99266b5a1c9d1f62b0e19595850462b1ac8a485b56e845
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, suggesting an attempt to drive traffic to potentially malicious sites. The presence of a 'download button' lure further supports the malicious intent, aiming to trick users into clicking the embedded malicious URL.

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/wb?keyword=convert%20pdf%20to%20xps%20document%20c#
    • http://files.turborenovations.com/uploads/1/3/1/4/131453588/2038804.pdf
    • http://files.sharonmaylinn.com/uploads/1/3/0/7/130738752/vibomugavor.pdf
    • http://jafoduzol.glynisfullwood.com/uploads/1/3/1/4/131437379/jabof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/kajawet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/spanish_to_english_basic_words.pdf
    • https://cdn.shopify.com/s/files/1/0435/0682/7429/files/as_3500_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/7564/7128/files/92690874169.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80835258875.pdf
    • https://cdn.shopify.com/s/files/1/0435/1872/2216/files/3126_cat_engine.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/pexefelaxav.pdf
    • https://cdn.shopify.com/s/files/1/0433/2997/8526/files/kibudezanuxufijagewe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1401/9496/files/nipalososavevijojol.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/tovagozizaxam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/25191546327.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/25021026801.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_off00006d1b.bin
2a0b7c49a234bf1149a6933b3e7cb1d345fed3388c1d6e610d1355636a37bb9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1B 5092 bytes
font_01_sfnt_off00007e68.bin
14bf32f5d5266ec26355abf50c1f69ce663ef186883d9001cfd46f14c91ebe98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E68 10080 bytes

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