Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58828bdaee6cbfd…

MALICIOUS

PDF

54.7 KB Created: 2020-10-03 13:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5c4a097a895baae102ea5cead1893c75 SHA-1: eb50b239df711f464ea577358501fb73546768ae SHA-256: f58828bdaee6cbfd629701e0f550ff080592388c4c888f9b1fd2588124213a5c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational content, likely intended to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness, supporting the presence of a malicious redirector.

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://ttraff.club/pify?keyword=metric+system+handout%252Fworksheet+integrated+science+1+answer+key In PDF document text
    • http://nuluvidu.cbsaimtt.com/uploads/1/3/1/4/131437158/7164605.pdfIn PDF document text
    • http://files.weddingmarchioro.net/uploads/1/3/0/7/130740521/1948277.pdfIn PDF document text
    • http://files.quirkyclean.com/uploads/1/3/0/9/130969045/04cbdfebe6.pdfIn PDF document text
    • http://fonekiwox.bluelotusbeadwork.com/uploads/1/3/0/7/130739553/losixovo.pdfIn PDF document text
    • http://ruziwireb.episcopalchurchredding.org/uploads/1/3/0/8/130874002/kagedorinin.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/a5e7c02b-4c07-4288-bdc2-8351e4ecba18/47703451209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b56584-7231-465d-aae4-d6029f99251f/vikofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ab608dc-3e84-4085-a579-57d969a5cd81/85654388045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68cbcd10-95c5-4b8f-a206-ddff7944621c/32106046142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d92069-3e4b-4b51-92cb-c06637a83442/98933319661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17699e70-f0ce-4ab2-b492-96a98c13dac1/52615073689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cffa683-8919-408a-b015-28e6cf056b91/wenifalebizurelapumedirul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d434ad-08a5-4050-9c18-d9735a686856/28085377308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4566a3-8803-4f8e-ac35-613465ebb232/serololibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39cb7ccd-c7b2-4bfc-a177-7da532864014/moxuzozetufikoromivaboje.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_off000093bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93BD 5672 bytes
SHA-256: 6a2ead0bd9b4de364ff6d269c12a3ef3eaacaeef85f78489825d3f36e01a1282
font_01_sfnt_off0000a717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA717 11740 bytes
SHA-256: 6fd361e9371643fc5f7ea24b9869db21e4a1da370465b79462f3632832c9623b

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