Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d73697dd3f82de2…

MALICIOUS

PDF

60.3 KB Created: 2020-08-11 08:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6dfb19cd1e34f68ea2b525600f41f10 SHA-1: d3f9bbd386b793db6fb3db9c90c5714c85235284 SHA-256: 4d73697dd3f82de2e518a75c613a8d848ba0fb55c9fbb84241818170b2f601b8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=retail+marketing+pdf+file+download'. This link is presented within the document body, disguised as a file download. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=retail+marketing+pdf+file+download
    • http://files.ivoryisacolor.com/uploads/1/3/1/4/131453623/gekokowu-wigotup-witiravuju.pdf
    • http://werur.bluemoonportraits.com/uploads/1/3/1/3/131383965/jopakufawiri.pdf
    • http://suvet.cranewyork.com/uploads/1/3/1/3/131398101/donimojupole_takawuwesezasa_mawotixidajizo.pdf
    • http://files.neondreamsthebook.com/uploads/1/3/1/1/131163949/tarasuwefogazav-xiwarow-rodibeferaga-tezepenarojenar.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/6077856318.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/ecocardiografia_transesofagica.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/11867331118.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/52109811391.pdf
    • https://cdn.shopify.com/s/files/1/0434/1009/6284/files/47689751435.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8233/files/lizose.pdf
    • https://cdn.shopify.com/s/files/1/0446/3860/1379/files/bloom_s_taxonomy_poster.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/fabuzasewibisegole.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/zerajako.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9681/files/kesadojenuzewevivon.pdf
    • https://cdn.shopify.com/s/files/1/0433/9643/2021/files/nakilogulawe.pdf
    • https://cdn.shopify.com/s/files/1/0455/4152/3621/files/2424472675.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a2b4.bin
0d5cbe7f42a437e84291840f3357aa9ad8cef6103bf537dec1aae8fac0e60cb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B4 5136 bytes
font_01_sfnt_off0000b423.bin
9301545b8ed5a2f4929b9978140b9cbd48529c8e3d31f6a5daa968e7a749041c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 9752 bytes
font_02_sfnt_off0000d58b.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 4324 bytes

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