Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf83ef8e51fe84e…

MALICIOUS

PDF

44.7 KB Created: 2020-08-07 17:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 235b4e0e463c6075f20c222aba56fcaa SHA-1: a7b8cedcbafdaf8822cef3eebaabbb2cad588dc1 SHA-256: 7bf83ef8e51fe84e4ce3ff55e61710e5563f7390c41281e0e61e546f104675fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains references to 'jpg to pdf' and URLs that are part of a link farm, suggesting a lure to a malicious conversion service. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment of a phishing or redirection attack.

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=jpg+to+pdf
    • http://wusad.oitsimapro.org/uploads/1/3/0/7/130738524/1191697.pdf
    • http://tuzezexas.pinwellbooks.co.uk/uploads/1/3/1/3/131383791/7204844.pdf
    • http://files.gayatripublicschool.org/uploads/1/3/1/3/131380440/modalasulu_vagukos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6697/3589/files/19742769179.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/28106148159.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/16302600719.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nepel.pdf
    • https://cdn.shopify.com/s/files/1/0446/7389/2515/files/information_security_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/denasovemonowi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/zasatikatutobavaxep.pdf
    • https://cdn.shopify.com/s/files/1/0444/1980/9447/files/ticci_toby_x_clockwork.pdf
    • https://cdn.shopify.com/s/files/1/0438/0426/2561/files/oxford_business_english_dictionary_for_learners_of_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/algebra_formulas_9th_class.pdf
    • https://cdn.shopify.com/s/files/1/0446/9538/8313/files/fram_filter_cross_reference.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006753.bin
576b1beded16736d2125d1c13f36a31fc0ea932239f3f05413d8a3010ea681b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6753 4196 bytes
font_01_sfnt_off00007595.bin
b3f152ed5638149a889423d77fc95e854a0da1efa77765aab7e00ddb21fb10cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7595 10076 bytes
font_02_sfnt_off00009807.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9807 4324 bytes

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