Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd375f9d466636a…

MALICIOUS

PDF

51.1 KB Created: 2020-08-09 01:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e990926dcd8607785facff1474e3b2ad SHA-1: df1cf410eec6e6a58b262908c7b80494597542ab SHA-256: dbd375f9d466636abbbb5b086ce2d5face5ecf35a680a9c62f10c496bc3976e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=texas+rental+application+form+pdf'. Additionally, the PDF hosts a link farm with numerous external PDF links, many of which are hosted on cdn.shopify.com. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the primary purpose is to lure users to malicious infrastructure.

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=texas+rental+application+form+pdf
    • http://jigema.nmillerillustration.com/uploads/1/3/0/7/130776445/jufob.pdf
    • http://files.cluessa.com/uploads/1/3/0/8/130814605/5411310.pdf
    • http://files.theroundhousefarm.com/uploads/1/3/2/6/132682039/zalavesotimak.pdf
    • http://files.americanlegionpost555.com/uploads/1/3/1/3/131380337/5461744.pdf
    • http://tuvefatun.themediamanager.com/uploads/1/3/0/7/130738837/fezesivoliwujukuwixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9388/5089/files/free_high_school_physics_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/mebivegaroraga.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/6636474316.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/97217805473.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/76651913707.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/lexojuvowusofasavonamev.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/vejana.pdf
    • https://cdn.shopify.com/s/files/1/0439/5152/1947/files/voxowawu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59854739703.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/lefepifilit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7824/5781/files/45191014377.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/49854940563.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6401/files/content_grabber_indesign.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_off00008a68.bin
6c4ec1598e8baee44a37da666e082d11747ee92c27710534280a186cdf491716		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A68 5320 bytes
font_01_sfnt_off00009c69.bin
6eff069d735da1be52102c1dd18464c71c74be2daf59e146ff88d5bc82f9bcbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C69 10068 bytes

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