Malicious PDF — malware analysis report

Static analysis result for SHA-256 639638c4246ecbe2…

MALICIOUS

PDF

52.7 KB Created: 2020-07-30 17:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f916c6f939c72cfa8fd2a2098b1c70d SHA-1: a669bbe95dd68b2bb179d504075d0c201ac5f8f5 SHA-256: 639638c4246ecbe2f1ad5fdd071e8014f1addf820b7fc5f0d49c8801b5db8512
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Greenhouse gas emissions by country 2020 pdf'. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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.com/pify?keyword=greenhouse+gas+emissions+by+country+2020+pdf
    • http://files.pathwayikthus.com/uploads/1/3/2/6/132695445/wavasamibixu.pdf
    • http://files.trudiboatwright.com/uploads/1/3/1/6/131637016/1643265.pdf
    • http://files.silvacontentsolutions.com/uploads/1/3/1/8/131871587/kovoba_sevafek.pdf
    • http://files.protutorapps.com/uploads/1/3/1/0/131071063/aeff1d7.pdf
    • http://files.uttxts.org/uploads/1/3/0/7/130775126/nifefifogurar-nubov-wuvonor-rezogezalofuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/monibide.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/61846317806.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/37171433592.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/wejupubolegenusek.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/sixuwuniwetisevum.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4693/files/liwimegib.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/92950010993.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/gopazosobuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/jozasabupopujavalibubi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8968/8731/files/93593198339.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/xexitodabigalugevaperug.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_off00008df7.bin
470e7664d51a0bfd5712cdfe88ede3ac3215ec78c5b558014ab280ec1f8e999a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF7 5964 bytes
font_01_sfnt_off0000a21a.bin
27c85fe4a1aae2012889577cd8025c6aa5ff7fed20d2bd03281ad7e0b3dd99f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA21A 10340 bytes

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