Malicious PDF — malware analysis report

Static analysis result for SHA-256 d168e1e37f49f35f…

MALICIOUS

PDF

52.6 KB Created: 2020-08-05 01:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2240acb0f22f8a5e9f3b70bb89a41170 SHA-1: 5b59c9a86449360458b5f3b90921d019e10d1e0a SHA-256: d168e1e37f49f35f30a9da03c4061384244cccaa92769a02c69f10990ddd63c8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=anemia+ferropenica+oms+2020+pdf
    • http://files.lcdals.com/uploads/1/3/0/7/130738974/2557062.pdf
    • http://files.sreesreementumaharaj.org/uploads/1/3/1/4/131406258/599005.pdf
    • http://files.ency-education.com/uploads/1/3/1/8/131871625/gumivu_fepobolebixo_fataninukut.pdf
    • http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdf
    • http://files.brookwoodpottery.com/uploads/1/3/1/3/131380612/fef1a0.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26433336276.pdf
    • https://cdn.shopify.com/s/files/1/0434/1320/9246/files/43382287769.pdf
    • https://cdn.shopify.com/s/files/1/0436/7548/4313/files/runojisijudobamofetawet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavoriduxosijalas.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/demezimepezujutomeripisu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/88395761584.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/73671142574.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/xukiwuragasarivozakitopit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5806/8633/files/mumadijomuzudapupug.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/knee_arthroscopy_surgical_technique.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7448/files/sepamogowurudibigujaviwuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2272/8866/files/toxelejomara.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_off00007da3.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA3 6744 bytes
font_01_sfnt_off00008e88.bin
589a089641110744e6acd3090ed81ee67b5f735b9315b32914f1f0449fd1550d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E88 5532 bytes
font_02_sfnt_off0000a141.bin
6f156c7a4b5cf94a56bc218b25eb401336773df0db20719ed50e3c41bd8b285f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA141 10420 bytes

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