Malicious PDF — malware analysis report

Static analysis result for SHA-256 201ae9424478f17c…

MALICIOUS

PDF

50.4 KB Created: 2020-03-30 15:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed91ba7b547b7beca342ea51570bd0fb SHA-1: 3082a533f7aefcd0179ab2cfa4483f0915858082 SHA-256: 201ae9424478f17c3f70a75c7018d24984f422ae1a459bceeda0ab5f19030c90
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files on various domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, suggests educational content ('Ejercicios letra cursiva para segundo grado') which is likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

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 http://adsl-63-204-18-59.benefitplans.org/uploads/1/3/0/7/130775972/130775972.html#ejercicios+letra+cursiva+para+segundo+grado
    • http://shutter-upphoto.com/uploads/1/3/0/9/130969950/678c3a.pdf
    • http://sloowmoee.com/uploads/1/3/0/2/130289365/fe3915.pdf
    • http://liegeholdings.com/uploads/1/3/1/1/131164564/0f5782a859b32af.pdf
    • http://everydaymemories.org/uploads/1/3/0/7/130740086/ropuridokizasoravuko.pdf
    • http://merraephotography.com/uploads/1/3/0/5/130590637/mafefupamisupe.pdf
    • http://bestgeekdeals.com/uploads/1/3/0/3/130379143/0928008e810.pdf
    • http://bipolarstarguide.com/uploads/1/3/0/3/130379370/sofuxisixuguzoxagefi.pdf
    • http://placentaedmonton.ca/uploads/1/3/0/4/130490875/9337789.pdf
    • http://turbochargedsolutionsllc.com/uploads/1/3/0/5/130588500/fakufubudub.pdf
    • http://rvhsfineartsboosters.com/uploads/1/3/0/7/130775318/8446880.pdf
    • http://sophiaeportfolio.com/uploads/1/3/0/5/130551726/4948709.pdf
    • http://yihfaonline.com/uploads/1/3/0/2/130289782/3500337.pdf
    • http://springbankmedia.com/uploads/1/3/0/8/130874612/7640857.pdf
    • http://karengibbsart.com/uploads/1/3/0/3/130312985/goxovakusipovo.pdf
    • http://darlingparrots.com/uploads/1/3/0/7/130776131/pepogufawod_mefifudi.pdf
    • http://sisk-support-services.com/uploads/1/3/0/8/130813055/nejiz.pdf
    • http://westcoastvideotours.com/uploads/1/3/0/3/130323318/pibofetime.pdf
    • http://pofofficial-callservice.com/uploads/1/3/0/9/130969372/fofumok-jaxat-takusufaloru.pdf
    • http://valentussuperslimfast.com/uploads/1/3/0/7/130775358/6424527.pdf
    • http://honeycuttpryor.com/uploads/1/3/1/0/131070146/nubixokowiwozul.pdf
    • http://ansaluxe.com/uploads/1/3/1/3/131397930/8a666254e69.pdf
    • http://21fds.com/uploads/1/3/1/4/131409200/kopubutixunefux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081f7.bin
16ca14d139283912aac8148258713f8f513e5549001c9cab9239b5770041a448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F7 9424 bytes
font_01_sfnt_off0000a3f7.bin
6f5589cf1763d9b30124e401b8407e77d4f7b0da0f268c3843f690d2cc1178e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3F7 16168 bytes

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