Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf59fa41ac1c5a9…

MALICIOUS

PDF

136.8 KB Created: 2020-08-07 21:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5c4fc5cdc9d5e0f918a171a9c73a2678 SHA-1: 3ff90eaafcd8142a517c686e86999a15b97ed401 SHA-256: 0bf59fa41ac1c5a9d092c9990b6ad4640f3df9debdb9b4beb3c46357edd7f8a7
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=english+phonetics+and+phonology+fourth+edition+pdf'. The document body, though heavily obfuscated, contains this same URL, indicating it is the primary lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=english+phonetics+and+phonology+fourth+edition+pdf In PDF document text
    • http://files.kspaceonline.com/uploads/1/3/1/3/131380868/b7e90.pdfIn PDF document text
    • http://files.rabbitomsamuels.com/uploads/1/3/1/4/131453749/livoko-petunenoru.pdfIn PDF document text
    • http://files.minibaraddict.com/uploads/1/3/1/3/131380308/midelid.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/benenij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/tojizanusaxanuro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/wijudoregamiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3437/7372/files/breckenridge_snow_report.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4324/8533/files/8926763824.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/68818633748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4506/9724/files/47153952442.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/xurelujofexuzes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/17472236703.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6769/4490/files/13363353720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/54500295986.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7578/8182/files/gosofob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1251/1128/files/dagitopokotipub.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001900b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1900B 11744 bytes
SHA-256: f20e191688fd186f099db994edc2cb6bee4e0a3e516db8cbf5e82077f6f66d2e
font_01_sfnt_off0001b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B186 5476 bytes
SHA-256: e6fd4cb856b01000ef04efdcb81fa3e3b8f0d6bc881669f3ba52804079fabea5
font_02_sfnt_off0001c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C436 9204 bytes
SHA-256: 377d612b9a71f7fc2d8208d872b495f106735dc07e0bd43b5244cdd37eabf5f0
font_03_sfnt_off0001d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6C8 10360 bytes
SHA-256: 7def953df2faef519c38778ed25246f0a39c18310f61aa53089edfa016a0cee6
font_04_sfnt_off0001fa4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA4D 17400 bytes
SHA-256: 344de1592bfe009f47e81efdd19bd9f7440cefa949f5ee943aced7237ff9ee06