Malicious PDF — malware analysis report

Static analysis result for SHA-256 607f736f3720b1c3…

MALICIOUS

PDF

50.9 KB Created: 2020-08-05 02:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4234cb6a0a69f89280da7ea3c9d016c5 SHA-1: 32ee7343ebc85fe6fc3cef97cebe558c4d2eac48 SHA-256: 607f736f3720b1c32df87d3871d42617f85ca436ce3f7a2dd94eb2b40e9675af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to 'Sistema capitalista e socialista pdf' and includes numerous external PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

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.com/pify?keyword=sistema+capitalista+e+socialista+pdf
    • http://files.itsbohobaby.com/uploads/1/3/1/6/131637714/volemogaragiwag.pdf
    • http://files.homeschoolingthespectrum.com/uploads/1/3/1/3/131379266/205a3ed05f.pdf
    • http://files.intuitiveartsandsciences.com/uploads/1/3/0/9/130969370/vavoduzovaru.pdf
    • http://files.mvnatmed.com/uploads/1/3/0/8/130873795/komuruzimanasof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5183/5801/files/91651865851.pdf
    • https://cdn.shopify.com/s/files/1/0438/5089/1424/files/27768365080.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8127/files/28058870148.pdf
    • https://cdn.shopify.com/s/files/1/0435/6141/8913/files/dezebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/majusotogozarow.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1047/files/18040795581.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/vovekowi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/tutorial_opencv_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/9639/2348/files/68042027033.pdf
    • https://cdn.shopify.com/s/files/1/0432/7292/9435/files/9895453027.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/2014_jeep_grand_cherokee_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/91490170955.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000087d4.bin
066140f4d5d4051c88b4bcb4fc6a0a015d06c09fb8c6028d3f19bab162fff25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87D4 5308 bytes
font_01_sfnt_off000099d3.bin
4907a0191a743aa95c7d80a88a212d44e137912262d5bb25adc6dd8c8ed156f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D3 11456 bytes

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