Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a1949f09ade92a…

MALICIOUS

PDF

43.1 KB Created: 2020-08-10 13:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ffed7ac858c28d5ab8b26269de0116 SHA-1: 7f29160b93cf8cf861aac55bffbb0a5928dd9d9a SHA-256: e8a1949f09ade92a181912f719f19bc8e5e7c0ca2597a4ae2799006ceec930ee
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link redirecting to a known malicious site. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=number+patterns+worksheets+pdf+grade+3', which is also listed as a malicious redirector. This suggests the PDF is designed to redirect users to malicious content under the guise of providing educational worksheets.

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=number+patterns+worksheets+pdf+grade+3
    • http://files.dragonflystrengthandfitness.com/uploads/1/3/1/4/131455621/refelate.pdf
    • http://vugam.archaiconlineshop.com/uploads/1/3/1/4/131453645/rigoxoj.pdf
    • http://files.zionec-mohnton.org/uploads/1/3/2/7/132712207/5678106.pdf
    • http://lukefi.christykillart.com/uploads/1/3/1/1/131164250/7294a297d3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4211/0625/files/78885919103.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/foxipavulasajewekivulen.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/884119030.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/mazosasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2281/9233/files/vemuli.pdf
    • https://cdn.shopify.com/s/files/1/0437/2729/0518/files/70204903826.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/73532533998.pdf
    • https://cdn.shopify.com/s/files/1/0438/4060/2269/files/bible_commentary_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/pozivulejuwo.pdf
    • https://cdn.shopify.com/s/files/1/0448/0407/9778/files/cosmic_ray_physics.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/selezozidenapi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/79689675033.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5109/files/mamufuru.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/57862806318.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_off0000612a.bin
ab7ce7b58527afeb1a340caa550e54eee9db9699c8c0137e145de7cebb3e7f58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612A 5852 bytes
font_01_sfnt_off000074fe.bin
a56a9dc635553df1477867158aaff09360964a414babf068e951ba30dffa7f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FE 13680 bytes

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