Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c85efbf78923d95…

MALICIOUS

PDF

50.2 KB Created: 2020-08-22 02:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a28333ec80582d10164c4d52581c9f4 SHA-1: d14733603306300631add1296569ca53d75f3abf SHA-256: 5c85efbf78923d958ab709695fb7cade06f75338a8669d525aae71aa62831dd9
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one prominently leading to a known malicious redirector. The document body, though partially obfuscated, includes the same malicious URL, suggesting an attempt to trick users into clicking it. The ML classifier strongly supports the malicious nature of this PDF, likely used as a lure for further compromise.

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=sca+barista+skills+intermediate+pdf
    • http://files.athleticsnorth.net/uploads/1/3/1/4/131408581/d5d1091c44991.pdf
    • http://files.millerwebdesignservices.evansconstructionconsultingllc.com/uploads/1/3/1/8/131860938/xexugikirav.pdf
    • http://povikel.merleabranner.com/uploads/1/3/1/8/131856040/gupogufevasez_kasebip_gatag.pdf
    • http://files.ourhandmadelife.com/uploads/1/3/1/6/131637631/d679c.pdf
    • http://metosiwij.bostonroundtable.org/uploads/1/3/1/6/131636612/jozemazofasigag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/92101549049.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/unir_archivos_online_sin_limite.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/jigalisufutigulumeke.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/71478310416.pdf
    • https://cdn.shopify.com/s/files/1/0429/4256/2460/files/canada_food_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/cost_accounting_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/41027715802.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/tumanogodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gejazopemovaro.pdf
    • https://cdn.shopify.com/s/files/1/0448/3337/4369/files/basic_human_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0446/6160/4505/files/microsoft_office_2019_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.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_off00006516.bin
6034cc4b2db8fb272dd09e46714edea4ba7dc8da0507680f276cdb7bfb15b74d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6516 8972 bytes
font_01_sfnt_off000082f4.bin
676e72b25adced65a0cc259c12178c2a6d3011ee84cac8ff8be42bc646679f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F4 5608 bytes
font_02_sfnt_off000095de.bin
1d67bf020281d7d4313ee2615b6809570761bba4f589761152f5537d15dbac8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95DE 11124 bytes

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