Malicious PDF — malware analysis report

Static analysis result for SHA-256 651d445843f9a4d3…

MALICIOUS

PDF

48.1 KB Created: 2020-08-09 20:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 407b2783c443213baef198953734b046 SHA-1: 58ab1c421d1eef28c65fe31feff66f90b6a918b6 SHA-256: 651d445843f9a4d38a3c1f30a540bc4283d98b8bfe18916eeef1598a1d4aa2ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify domains, suggesting an attempt to manipulate search engine results or create a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'chemistry book 11th class pdf' and the malicious URL, indicating a lure to disguise the malicious intent. The ML classifier 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.com/pify?keyword=chemistry+book+11th+class+pdf
    • http://files.wagnersmarket.com/uploads/1/3/1/3/131383648/lomawofex.pdf
    • http://files.louisebritton.com/uploads/1/3/1/1/131163736/11bcf539.pdf
    • http://files.tremletts-carpentry-joinery.com/uploads/1/3/0/7/130775707/nobix_nutudizo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/44374684718.pdf
    • https://cdn.shopify.com/s/files/1/0437/7188/7767/files/5th_grade_math_volume_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/voluridame.pdf
    • https://cdn.shopify.com/s/files/1/0430/2887/3367/files/arithmetic_reasoning_and_analytical_thinking_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5319/files/aviso_de_privacidad_estado_de_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0434/4587/8950/files/22047559414.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8940/files/duo_therm_57915_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9213/files/nilefedemenarunokavevomod.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/xararanoxubapevusijezej.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/84540468453.pdf
    • https://cdn.shopify.com/s/files/1/0443/4133/0076/files/blend_for_visual_studio_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/mupedo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2054/files/go_math_7th_grade_accelerated.pdf
    • https://cdn.shopify.com/s/files/1/0431/0168/3865/files/datitupigofobuputaj.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006159.bin
9f8e7ec6865b08bc1f38229c18f24995cc318bbfda1eeecf783bd484e14326e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6159 5456 bytes
font_01_sfnt_off000073ec.bin
419e22cf8ce81aaf7f3b1ea304162d861281523e98f93b3fae1983a8e4bb49d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EC 10652 bytes
font_02_sfnt_off00009852.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9852 4324 bytes
font_03_sfnt_off0000a652.bin
ec80bf2ad916edd5855bb04d4b505d8af8ddef27f972b225c7a7e3402e08607a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA652 3260 bytes

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