Malicious PDF — malware analysis report

Static analysis result for SHA-256 7658e12df562e783…

MALICIOUS

PDF

62.3 KB Created: 2020-07-30 17:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea43db7d2c7655fbee4cdff43695fdd4 SHA-1: 1c92ae29ffe6389cea453e02b943eec636612548 SHA-256: 7658e12df562e7838710ca48e3f0daa6d7225cd227a38f85105417b9b2195e53
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as academic IELTS samples. This indicates a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an intent to redirect users to malicious infrastructure.

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=ielts+writing+task+1+and+2+academic+samples+answers+pdf
    • http://files.overcomeporn.org/uploads/1/3/0/7/130739776/47a30b2e7cd.pdf
    • http://files.entropiapets.com/uploads/1/3/1/8/131856547/6050137.pdf
    • http://files.elementmaster.com.au/uploads/1/3/2/3/132302718/geregonubuv_kibikixasima_vosobu.pdf
    • http://files.nmfwa.org/uploads/1/3/1/3/131384442/5720457.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/5276/7131/files/zedurafakopuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6588/5351/files/46070909985.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/88114212433.pdf
    • https://cdn.shopify.com/s/files/1/0431/6119/0559/files/zaleze.pdf
    • https://cdn.shopify.com/s/files/1/0432/9101/7374/files/25357621592.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/93839265748.pdf
    • https://cdn.shopify.com/s/files/1/0432/4835/3442/files/78300720582.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1559/files/69888352098.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/desoxuzabebunemamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/93554510087.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000998f.bin
1db6e67fcb12ed28f4a340ff4da5fd5b817478ec41d7fe03c2303f3b53863401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x998F 5428 bytes
font_01_sfnt_off0000ac01.bin
e764726cb5abecfffe7077abab1eb3082d7d4ef8c976e1c8fa0948768ce02d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC01 14980 bytes
font_02_sfnt_off0000d684.bin
5d72d630640305d452d914085fd6c65e0d8125198bed8028c282d44fd0327be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 16068 bytes

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