Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e79610b4252ef7…

MALICIOUS

PDF

42.0 KB Created: 2020-11-02 09:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 19a7a4e1c8ade4cd10ee0ac0e693219b SHA-1: c1e045b959179a5abf44600aaf69e6045b8bc60b SHA-256: 27e79610b4252ef7240d96112a6acbdc1f011ce5cc7f0568cdae908e66fef8fd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'worksheet' and includes a URL that appears to be part of a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=alamo+reading+comprehension+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_5f973545f19da.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/b0b03f7781.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/7e6b64.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/xidilofig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f89c2efd8870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f8868d531b7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_5f9eb12fa0aa4.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/d2c101.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/kavitokolezub/hallelujah_piano_solo_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b5f911a-68ac-47b3-857c-31cc6df11f1f/dragon_age_inquisition_dragon_killing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/comparing_apples_and_oranges_origin.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/carescape_r860_ventilator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c224056c-cb0f-4b51-a335-d790df634001/vupix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9586/6524/files/pirate_songs_lyrics_for_preschoolers.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/43035277006.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/dependent_personality_disorder_test.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_off000064f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F0 5632 bytes
SHA-256: 73f1f028875165085d3d852147f118fb8f222ddd97863fc36e9e67bb5b9bdc02
font_01_sfnt_off000077ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77FF 10276 bytes
SHA-256: 8183e20745e3b2afed2000ad78ab197b669d063f259b5b28d5659faca29ed9c3

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