Malicious PDF — malware analysis report

Static analysis result for SHA-256 1529a28184e88c13…

MALICIOUS

PDF

53.8 KB Created: 2020-08-12 00:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07c6c4aff98273341e417ad067ced38c SHA-1: e248c29a4fa8d8de4060747ea351974b503e893a SHA-256: 1529a28184e88c13d8134a58092788cf86d4abebc9de72523cc8a17b30289525
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 what appears to be a link farm designed to host academic papers. One of the primary links, however, redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to academic papers and the malicious URL, suggesting a lure to download malicious content disguised as study material.

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+last+year+paper+with+solution+pdf
    • http://bevujiv.mbcdoulaschool.ca/uploads/1/3/0/7/130775934/podelawepipogebo.pdf
    • http://sewik.candlewyckhomes.com/uploads/1/3/0/8/130813765/2438796.pdf
    • http://files.edgeofstyle.net/uploads/1/3/1/6/131637889/lotuxexabuzava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/9835/8428/files/24211633732.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/balanced_binary_tree.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1040/files/zusetogurexofazaxito.pdf
    • https://cdn.shopify.com/s/files/1/0436/2492/3298/files/aerodynamics_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0768/files/nateladamuzagub.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/67465536684.pdf
    • https://cdn.shopify.com/s/files/1/0434/6668/6629/files/rawava.pdf
    • https://cdn.shopify.com/s/files/1/0437/1942/6198/files/wefuninubatebomarol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2426/8968/files/free_amharic_orthodox_books.pdf
    • https://cdn.shopify.com/s/files/1/0439/4595/1400/files/38413536898.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/43406795801.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006163.bin
83b107ee28a27d31d566d8715096459ee75d48c35fc48a8398517e8495453771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 5372 bytes
font_01_sfnt_off000073ad.bin
5c142e21529c3008cd9965c43e0f8c5d3dc883d3fc94227741b9e95ea3527861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 5648 bytes
font_02_sfnt_off0000836c.bin
2ffd1ce48af8af121ff33842044ec9e8673585f04015edc278c2c6248288e4f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x836C 10240 bytes
font_03_sfnt_off0000a676.bin
7a7e0f9cb89785dee93ecfbcc78ef93b5a18a5022886c2d5a0bf15d9412c15a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA676 16224 bytes
font_04_sfnt_off0000bbfe.bin
21cedf5b71e6b39afe8c8afd78a750cfb6b6ec6b92560ed3201933dfcdfafcf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFE 3420 bytes

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