Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4ce5d3b5a0489b…

MALICIOUS

PDF

49.2 KB Created: 2020-11-09 16:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d6970f84603806d245948970f46c7f5 SHA-1: 7c3bb8af9163afc3265fd9a62449fbd117e3329d SHA-256: 0c4ce5d3b5a0489b2b39fec394bf65091ec34dd99e16f916146bd4bccf4d293f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to mathematical calculators and includes the malicious URL. The presence of a link farm heuristic further supports the malicious intent of directing users to potentially harmful sites.

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://traffmen.ru/strik?keyword=slope+intercept+form+calculator+with+2+points
    • https://nevitasez.weebly.com/uploads/1/3/4/3/134305442/fimaj.pdf
    • https://vukumurumijolot.weebly.com/uploads/1/3/4/4/134433046/3d5fe3090b.pdf
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/5389138.pdf
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/a6467c1ec800.pdf
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/bidov-rebexinewapuje.pdf
    • https://lebotuzipum.weebly.com/uploads/1/3/4/5/134519329/291a99.pdf
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/6265756.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xelimewat/apollo_s_lyre_location.pdf
    • https://s3.amazonaws.com/zifozujiwi/free_further_mathematics_textbook.pdf
    • https://uploads.strikinglycdn.com/files/fc941cf5-3c50-4b78-886c-494687e70ce1/kc_soccer_dome_north_kansas_city.pdf
    • https://uploads.strikinglycdn.com/files/f90662ed-e897-4c5a-bc1d-7bd6d46f6b30/mission_federal_credit_union_national_city.pdf
    • https://s3.amazonaws.com/dudigonifu/xabirikizupimebuleko.pdf
    • https://s3.amazonaws.com/nilafafakem/finding_zeros_of_quadratic_function_worksheet.pdf
    • https://s3.amazonaws.com/zerejibixupav/agricultural_tools_and_their_uses.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067a2.bin
073229a6cff0a92d5f1715cc50ae3b8572cb58e60c130578c537e8fffc65cea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A2 5580 bytes
font_01_sfnt_off00007a84.bin
95eae358fd7a892bb533a49f3485861d68dc32253429e8426653ab179cb1c222		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A84 12136 bytes
font_02_sfnt_off0000a2da.bin
aba6d7228e0fcc42341ee09250d9598a413f48202077e5963e65f524ed209447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2DA 16080 bytes

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