Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe19736ee267540…

MALICIOUS

PDF

38.4 KB Created: 2020-08-21 04:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbacc5db235ed3e7490d54484ad3df93 SHA-1: 2a24c2d23eac78948705145ae562ac18c51b15d2 SHA-256: 5fe19736ee26754009e51c761bdd71f5bf16ececf1a6bd699f8b12a39b600e1e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Bond university international postgraduate application form' and multiple URLs, including the malicious one. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many of which are to Shopify-hosted PDFs, suggesting an attempt to manipulate search engine results or distribute content. 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=bond+university+international+postgraduate+application+form
    • http://files.watips.net/uploads/1/3/0/9/130969085/tefiwibajizu-pokotuvotaxomi-tikeg.pdf
    • http://didug.wilderblubordercollies.com/uploads/1/3/2/8/132814930/korazevazukubu.pdf
    • http://files.mrusselldesign.com/uploads/1/3/1/4/131407705/048fbef28c7825.pdf
    • http://dogosise.twinlakeswaterskiclub.com/uploads/1/3/1/4/131437601/655d37573ce077.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/cat_on_a_hot_tin_roof.pdf
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/67377236047.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2931/files/44266400927.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/alcoholismo_causas_y_consecuencias.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4025/files/witakuziwujix.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/34105887404.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1487/files/mdu_b._ed_form_2018_last_date.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wizivudid.pdf
    • https://cdn.shopify.com/s/files/1/0454/2916/2152/files/asthma_diagnosis_test.pdf
    • https://cdn.shopify.com/s/files/1/0430/7723/8945/files/paradise_lost_book_1_download.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_off00005365.bin
a778729557f7506a1f63f8a107f6406d4032527e05954a6b13db3aa57d698bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5365 5688 bytes
font_01_sfnt_off000066b7.bin
7bd749623a2d3b2a858094842ba330437cf16eb077459467f13ee38e01b15c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B7 11088 bytes

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