Malicious PDF — malware analysis report

Static analysis result for SHA-256 520bca7cf636a04f…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 04:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3020e0a82a5b2ec233527029a0b7ddea SHA-1: c4a4da961a2eda32629482bd1ca935fbe5b5f6b1 SHA-256: 520bca7cf636a04fec0103faae86198e2c1f22aefda178f706dfa0b2cefeb29c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Alimentacion saludable para diabeticos pdf' and a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely social engineering through a deceptive link.

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=alimentacion+saludable+para+diabeticos+pdf
    • http://files.nicoleedwardslimited.com/uploads/1/3/0/9/130969639/dfb54201395.pdf
    • http://vimabul.triangleyouthballet.org/uploads/1/3/0/7/130776738/9dda8bd5e00b8e7.pdf
    • http://rezuwevaf.myorianstudio.com/uploads/1/3/1/4/131408027/wegojikinotu.pdf
    • https://cdn.shopify.com/s/files/1/0446/9247/1962/files/10th_class_science_notes_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0440/0755/5222/files/67036692483.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/laminate_flooring_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/tofiliv.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/annapurna_devi_stotram.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/ketesebedogo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/letawowapojezed.pdf
    • https://cdn.shopify.com/s/files/1/0430/6767/0689/files/rufon.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/60454385837.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/toro_ccr_2450.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6720/files/24936330463.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/pubetolaguz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0800/8090/files/36673601534.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_off00006e5c.bin
5ffeeb096c7c85df63eb649e988fa431b6bc62b66938a389efdc6152f3199bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5C 5432 bytes
font_01_sfnt_off000080a7.bin
bae8441d3ce94be164adadb22cfc28df581d7534dfa661d2765004c99b5f15ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A7 10672 bytes

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