Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a9b9454e853a6c…

MALICIOUS

PDF

45.6 KB Created: 2020-08-15 02:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 261171433135b952e426182317a6d1fa SHA-1: 6d2f5492e4cf0d5a60bd165d9bd249cfbff91cb4 SHA-256: 75a9b9454e853a6cf6915d3f0612f8f7bd0111175fe074c261e914d1203eabaf
154 Risk Score

Malware Insights

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

The PDF document contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=ambrose+alli+university+post+utme+form+2019', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain similar URLs and text related to university forms, suggesting a phishing or social engineering lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external links, including to potentially benign Shopify URLs, points to a link farm or distribution mechanism.

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.ru/pify?keyword=ambrose+alli+university+post+utme+form+2019
    • http://files.artbyleonardos.com/uploads/1/3/1/4/131456012/4217919.pdf
    • http://gatajik.somethingbymelanie.com/uploads/1/3/1/4/131408899/8426461.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/kevop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/zavonudedowiwisenaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5172/8546/files/lazoxofutuxarej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/80364244884.pdf
    • https://cdn.shopify.com/s/files/1/0434/5918/2745/files/nba_2k13_cheat_code.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6966/files/tiwowunub.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/36578729661.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/87506690192.pdf
    • https://cdn.shopify.com/s/files/1/0434/7848/3096/files/tezusejatosakupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3377/9611/files/when_do_you_use_binomial_and_cdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/sojujororoponosedene.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_off00006423.bin
5b2c3670b1fd67af33a57b5e92d85e61382025bab7287d46f057cb284c0cc283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6423 5700 bytes
font_01_sfnt_off0000777c.bin
59c6e202270cf0070ba73dfdf276a95be1062893e7632f9872f476aa2204890b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777C 10488 bytes
font_02_sfnt_off00009b5a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5A 4324 bytes

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