Malicious PDF — malware analysis report

Static analysis result for SHA-256 73125e8971146de0…

MALICIOUS

PDF

34.4 KB Created: 2020-11-06 03:56:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 87ee602930b63b3e77a320da5d8e6063 SHA-1: 85a53672abe2b11919580ad8c74e256a0ec95169 SHA-256: 73125e8971146de0ca99ff9f9bbae00701ffb4811535e4f6c5c0a6818242c2cc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, suggesting it is part of a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'science lab safety rules worksheet'. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=science+lab+safety+rules+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f9d8af51a2a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_5f9a0da8c361d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f8c5a0739761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375894/normal_5f8b99521c163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_5fa0fcae111d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f90a65081132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_5fa2678900e7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gulapore/war_eagle_conference_iowa.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/jacob_kounin_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/15886858149.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9419/5870/files/xezonopelovuxesotopisod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c789fa03-a96f-4223-a8f7-f204347de379/55503065594.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/maniobra_de_cattell_braasch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8555/2535/files/2701130775.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/srimad_bhagavatam_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c4fb15-61ce-4b12-9fd7-317e1ddaa6cc/kodupotufekilaxima.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/14732553732.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_off00004991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4991 5468 bytes
SHA-256: 3a265670ad3939722df78938623d96fa0e11cbf4e70c96e539c017364e8b33a9
font_01_sfnt_off00005c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C41 9524 bytes
SHA-256: df2da555bac9e0ecc60b06f2756964b9717a68541dc0c8330804735e05fa3a9d

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