Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfdf88bbadd5709…

MALICIOUS

PDF

38.0 KB Created: 2020-10-31 03:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cfccba91d4e6b463019451b640f67240 SHA-1: d5ee71b9538f103148a41242d03cc4f47f67fd24 SHA-256: 5cfdf88bbadd570942d18a53a4d207d017fd4c702ec3dc604a7c07bb13b1679b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely serve to direct users to malicious sites or download further payloads.

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://cctraff.ru/aws?keyword=humi-care+herf-a-dor+instructions In PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/biteleluvupuvonom.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/314860.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6831bbb3-fe78-4b75-a110-708698715dae/gobog.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/adventure_quest_best_weapons_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6099ee2e-b87e-4b6c-9a09-d58930c7ef15/rusty_cage_real_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f41bef-2de3-4951-993c-8d070bc07fac/mat_foundation_design_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4842/5379/files/80833642221.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/phr_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d3d999-73f8-4265-a008-13ef2708e8ac/boxew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3727b653-768e-4e00-9cb8-e86fa2ad4dda/55194340498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e67bd6-9762-4f9d-95e9-9915f5239d18/runubaxovujovuro.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/gibiseduxenowowadum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e70d35c9-4de8-4512-9240-32eac5e2e15a/tizulowojuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8799/4263/files/erdas_imagine_2020_tutorial.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_off0000562a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x562A 5220 bytes
SHA-256: 55c609d12014a9cfee855733ad97f0043b46b88b90d7d23e535b6e58677173c6
font_01_sfnt_off000067c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C6 10416 bytes
SHA-256: b9164a999f03396d0e943db1e563e68607442b8df74c04811b4a28a8c62ef80d

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