Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c2c5a3cf984b94…

MALICIOUS

PDF

37.0 KB Created: 2020-08-17 00:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e85691f8712066b2b95f06a8a28cb8f3 SHA-1: a36ef6b2469aca29ac60dafd629f4642f14039b1 SHA-256: e1c2c5a3cf984b940dea712e5ba10ba1e2f448b394f4da433115be16a3019155
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector service. This service is likely used to obscure the final malicious destination, which is a common tactic for phishing and malware distribution.

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=area+of+a+triangle+mathworksheets4kids
    • http://jojaj.tessatravels.com/uploads/1/3/1/1/131164250/koledu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8175/0941/files/bangla_awas_yojana_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/2508/9191/files/66960168847.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/adobe_air_runtime_android.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/1000_basic_english_words_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/29065764794.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/bevuwulafexabewapokot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/mireriwawavetupi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/pisulidipetemimubumowe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1480/files/51099124377.pdf
    • https://cdn.shopify.com/s/files/1/0438/3057/5266/files/3915608940.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005323.bin
a62f486017080e5eb879585c8be503ad9d67fe7265cf9ce9acf5be9078e7c353		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5323 5556 bytes
font_01_sfnt_off000065e9.bin
42f62b21163896adb191a666583f2f9a6e2cd6eebcb0f9da72ef5366e2777340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E9 9888 bytes

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