Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4521cb5e7757136…

MALICIOUS

PDF

40.5 KB Created: 2020-08-13 22:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a72a5bdff693439631aba7e2157dd974 SHA-1: 3d5e589b29ef1cd6fd4183caec09e7e14b1a71e4 SHA-256: e4521cb5e775713627a89b1a0711cc2a2b2fd9e253fcac2c25a2f53f19714079
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=halloween+division+worksheets+5th+grade'. The document body, though partially corrupted, contains text related to 'Halloween division worksheets 5th grade', suggesting a lure to disguise the malicious intent. The presence of numerous links, including those to potentially benign Shopify domains and other unknown domains, indicates a link farm strategy to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=halloween+division+worksheets+5th+grade
    • http://files.risingphoenixtattoo.com/uploads/1/3/0/8/130874085/7882118.pdf
    • http://gajit.dongpu.studio/uploads/1/3/0/8/130814328/9914964.pdf
    • http://zekutirad.happyvalleyanimalsinneed.com/uploads/1/3/2/6/132682883/3113792.pdf
    • http://files.eclipseconcrete.com/uploads/1/3/0/7/130740092/susazibikatebafovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/28599357687.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/xisuzowupigebekibakovoba.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/88864146373.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6910/files/81140511067.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/64599918950.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2017/files/vivowiviz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/gorikatijurusavafowutuse.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/tuduzes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/28411117554.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_off0000600b.bin
b4a00f8ecb2ff4e0726e7cbe5e152c0690313598f0b486eaeffab3227d8ab2bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600B 5388 bytes
font_01_sfnt_off00007270.bin
ce04f9ca6896d19e940f90bad2f1ade04d0cbe04a5d8ca5f80f51fb8f383a0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7270 10076 bytes

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