Malicious PDF — malware analysis report

Static analysis result for SHA-256 347884afbc3f3937…

MALICIOUS

PDF

45.4 KB Created: 2020-08-10 07:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e817304cfeec6ef06dda76c77a825b07 SHA-1: 2b05792b9cd40bf8231c516795480462285e3e3a SHA-256: 347884afbc3f3937452a529798b8c65864fd57a4c49a51c4d8c6e1772ddd2bb0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'After effects tutorial pdf for beginners' and the malicious URL, suggesting a lure. The presence of a link farm further indicates an attempt to distribute malicious content or drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=after+effects+tutorial+pdf+for+beginners
    • http://files.versavisuals.com/uploads/1/3/1/3/131398360/ab199dd891238.pdf
    • http://files.alburghschool.org/uploads/1/3/0/8/130874110/pifokaxoforu.pdf
    • http://files.kikayscleaningservices.com/uploads/1/3/1/0/131070169/14216a.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3610/files/zulevebavoretevopokebofum.pdf
    • https://cdn.shopify.com/s/files/1/0429/3266/6524/files/80164100034.pdf
    • https://cdn.shopify.com/s/files/1/0428/4078/5062/files/biggerpockets_brrrr_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/74171519396.pdf
    • https://cdn.shopify.com/s/files/1/0448/0489/8978/files/ejercicios_alcanos_alquenos_y_alquinos_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3258/files/85912501301.pdf
    • https://cdn.shopify.com/s/files/1/0429/7624/7967/files/rekeke.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/26393221374.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9896/files/sinusitis_aguda_tratamiento_antibiotico.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/gigamobawunuwuluzapulil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bebupikisanomagidilu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006775.bin
589ffa22594883439f2e115498d11a45f2f6c6baac14e73c265e44d29a73c106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6775 5332 bytes
font_01_sfnt_off0000799f.bin
c104ab1ef4967b40c77ad6e440b8b73c07008c6ccae6904db2b533ddb570e388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x799F 9640 bytes
font_02_sfnt_off00009a98.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A98 4324 bytes

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