Malicious PDF — malware analysis report

Static analysis result for SHA-256 facd365441ecb191…

MALICIOUS

PDF

67.6 KB Created: 2020-11-03 20:36:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 58ea549545182f8c71225b82d3e0bafb SHA-1: 1b03c54ae48a5a45ab0e2798654ea59f33e5c40c SHA-256: facd365441ecb19122c586981726e6d44cbc4a2b1b5191f34c4a5e705d47536f
152 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, disguised as answers to a 'Code.org unit 4 assessment'. The document body also contains a URL pointing to the same malicious redirector. The presence of numerous external links suggests a link farm or SEO manipulation tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9106

Heuristics 3

  • 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.
  • 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://gettraff.ru/aws?keyword=code.org+unit+4+assessment+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_5f9bb56a01b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5f8fe28a5ba82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5f9293d5c6da8.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/a8f8e4e986ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f8ab7501913e.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/roriturosiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5f8f47cebcb3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f9384708aca6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3141/3415/files/nitro_to_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/parental_care_of_amphibians.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/22370768175.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/most_electronegative_element_list.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/73349119431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9425/9912/files/vubazosa.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_012_off000101f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x101F5 4208 bytes
SHA-256: 853e27e4f812da7e171bbb827fca761929113ec7291d489d3783aace9fb40f52
font_00_sfnt_off00006193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6193 5600 bytes
SHA-256: 6053de1a5276d75a31db83fa71a41e3f3d560335168491c25ce3f2b35b20eb49
font_01_sfnt_off0000750f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750F 5232 bytes
SHA-256: 815804cacf1982e213c19dcaa7ffa08d0351e309f2936d9581377a034cf4a886
font_02_sfnt_off000086d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D6 2656 bytes
SHA-256: 1620336da6018abf771a3b64a4739dbc5cc5761e5bcfd31f9568e9163b5e6178
font_03_sfnt_off000091d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D7 5032 bytes
SHA-256: d65353c1e58b8117dba3b6111dc10a97bd845c7ddcedb9792c302b0022a08e3b
font_04_sfnt_off0000a10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA10B 3840 bytes
SHA-256: 869700f7b438b0b0f23cfbf3a170597ae1a6b01e9ba9f60fe7298d5eefb98f81
font_05_sfnt_off0000af18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF18 2108 bytes
SHA-256: b3976ad28991401f3a7e0d936621f3963ed8fd81aff5bedc9e25cf6548b1959b
font_06_sfnt_off0000b8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E3 6640 bytes
SHA-256: c8cb303e765c67f43d6d34f29c1d02953890772ff7b697be779fb29335000f72
font_07_sfnt_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 18232 bytes
SHA-256: d80f73854bd4672226a1c77bd2ba4fda75828e3f426620c713987810c91fd528

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