Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d3a0061e4333a…

MALICIOUS

PDF

55.0 KB Created: 2020-08-04 09:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28d1aca37b66c16f9883aad3be6f9ec4 SHA-1: 9efbf869a63d04e1078c7e4cdc8176065bf668f8 SHA-256: 924d3a0061e4333aed366577873be199ba9ede61424c9da1023a903d7193a809
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure for downloading potentially unwanted files, disguised as academic papers. The ML classifier strongly supports 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.ru/pify?keyword=bitsat+previous+year+question+papers+with+solutions+free+download+pdf
    • http://files.texler.org/uploads/1/3/2/6/132681392/43451e289b9b4.pdf
    • http://files.healingindiaglass.com/uploads/1/3/0/9/130969801/vojiz_jilunuwaxa_vusekevine.pdf
    • http://files.franklywines.com/uploads/1/3/0/8/130814258/rufozoxibanujaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/14381964838.pdf
    • https://cdn.shopify.com/s/files/1/0431/9290/9987/files/slavery_in_europe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46150969179.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/lasozutiwin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0533/6985/files/fidune.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/31591968761.pdf
    • https://cdn.shopify.com/s/files/1/0437/1028/3931/files/mefumumalepeburulabu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6427/7657/files/maruti_800_carburetor_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0429/1490/6275/files/xugad.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/lemixegutamezunisaduk.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/ignition_system_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/67197790481.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/fonuxusuvupipulukel.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000648e.bin
696525f519af58c0c8f37090288390412523c514b14ddeb275c754723c3dabe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648E 5560 bytes
font_01_sfnt_off00007784.bin
5c142e21529c3008cd9965c43e0f8c5d3dc883d3fc94227741b9e95ea3527861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7784 5648 bytes
font_02_sfnt_off00008743.bin
2ffd1ce48af8af121ff33842044ec9e8673585f04015edc278c2c6248288e4f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8743 10240 bytes
font_03_sfnt_off0000aa4d.bin
7a7e0f9cb89785dee93ecfbcc78ef93b5a18a5022886c2d5a0bf15d9412c15a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA4D 16224 bytes
font_04_sfnt_off0000bfd5.bin
21cedf5b71e6b39afe8c8afd78a750cfb6b6ec6b92560ed3201933dfcdfafcf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD5 3420 bytes

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