Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7145a4d59fab81…

MALICIOUS

PDF

45.5 KB Created: 2020-10-26 17:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3109d4f66c32292276b998a17995b69f SHA-1: 91334e7f3fcbb5282e29aff35267a3102c9d58ee SHA-256: 5b7145a4d59fab81246989a6d418e04f59e8c2d948192750aa8683e66d0361b1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at `ggtraff.ru`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The presence of many links, some of which are benign, is characteristic of SEO link farm techniques used to improve search engine rankings for malicious 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://ggtraff.ru/aws?keyword=basics+of+economics+pdf+for+upsc In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6192/6293/files/verizon_kyocera_flip_phone_battery.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6862/7384/files/novebituf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1547/4847/files/bapupanotar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82cd266a-e802-4635-90be-10b79f188cf5/bosokizukiwulejoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b168a27f-335f-4b12-8ded-1b60ec61b29c/taxabijok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab661b7-dc13-40ad-8ac1-98392e6068b3/vupokijazezenogerij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5068d11d-f72c-4d52-9957-8529a93ddbcb/99823590461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9c39f7-9ce7-4626-aa6d-ff981f32b498/zononepos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add97688-c5e2-4c73-baaa-b3d6907e91e7/42503568201.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/cds_2019_english_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/dell_latitude_7490_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df9c0dc-507c-4df2-810b-46744cf5a7c3/84941726236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723704ce-86b4-430b-b248-07b5dd2243a3/38219062263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3f3345-f30e-4cb2-afa8-c8d24bfe2337/learning_radiology_podcast.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71ED 5320 bytes
SHA-256: 138cf0102479c078fa5c54fd104c32898c9ef9eca0be659d09cc7e096677338f
font_01_sfnt_off000083db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83DB 11224 bytes
SHA-256: a839b514bd0a232717b3309fd1c1e612c83174f2a5c21f2dc2eef41cd78b3b58

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