Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a541563add8dc5…

MALICIOUS

PDF

42.1 KB Created: 2020-08-04 07:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05eb4d49b75f70e400c88f4a1e380c6a SHA-1: f1efb0584d9867ac0c74e1dbd566300b4c908ab5 SHA-256: 03a541563add8dc524761cadcff9b0e4d3303238f147ef728b3a092099b13340
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host academic-themed PDFs. One prominent link, 'https://ttraff.com/pify?keyword=ielts+academic+writing+task+2+questions+and+answers+pdf', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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+academic+writing+task+2+questions+and+answers+pdf
    • http://wezig.musicandartattrinity.org/uploads/1/3/0/7/130739625/pulazonego.pdf
    • http://files.craftyfoxstudio.com/uploads/1/3/1/4/131453034/kasifokupoz-fotatimejuxekab-mevavipinope.pdf
    • http://files.gradesix.nestmusic.org/uploads/1/3/1/4/131453526/19ac6b7.pdf
    • http://files.oshadows.org/uploads/1/3/0/8/130874197/zemanof.pdf
    • http://files.lakefieldvisioncare.com/uploads/1/3/1/4/131406806/8877029.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/sinalojamufikajinisuxine.pdf
    • https://cdn.shopify.com/s/files/1/0432/6182/1083/files/3679016951.pdf
    • https://cdn.shopify.com/s/files/1/0431/8560/2721/files/rimuboso.pdf
    • https://cdn.shopify.com/s/files/1/0432/4379/8683/files/function_of_trna.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0436/4120/8992/files/42246124484.pdf
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/98382434077.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2224/files/foribizaxudo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/vamazazebexekejaba.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4882/files/lifojeganikegubikedeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1726/files/bogizafatupobatupimeluwaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/96100593808.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_off000063bd.bin
06027cb7be355eaafd5c779af687a30cec95fbd7495d2f358697e8ab74ab4ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BD 5828 bytes
font_01_sfnt_off00007792.bin
22dbdfa593398c28b2c6948add6d2efdfeeef05d692b9000cfa9a1e46871a4bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7792 10408 bytes

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