Malicious PDF — malware analysis report

Static analysis result for SHA-256 87038abb7f197bc2…

MALICIOUS

PDF

48.2 KB Created: 2020-08-05 05:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0faa1b477a3bb1cd7bb8713d7211e09f SHA-1: e556378d480614d3d4acc5708722a92dfc6df3ce SHA-256: 87038abb7f197bc22c5bcf0e9dcfd7447e13700cb07b3e9400de36457e9b872f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.com', which is flagged as malicious. It also hosts a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains the same malicious URL, indicating an attempt to trick users into clicking it. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence suggest a phishing or malware delivery attempt.

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=tratamiento+endovascular+aneurisma+cerebral+pdf
    • http://files.fremontlocalfoods.org/uploads/1/3/0/7/130775980/e56ea3fef3.pdf
    • http://files.mischievousslc.com/uploads/1/3/1/4/131453998/7453219.pdf
    • http://files.jpendersbyltd.co.uk/uploads/1/3/2/7/132741130/33986b75aa565c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerisorajomowuba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarozasupevukofapunaxovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/kokegovamenufedagowafisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15900382268.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7112/files/47085819439.pdf
    • https://cdn.shopify.com/s/files/1/0437/0844/8922/files/gateway_buckshot_mudder.pdf
    • https://cdn.shopify.com/s/files/1/0431/7210/2308/files/90988515791.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7679/files/63840063611.pdf
    • https://cdn.shopify.com/s/files/1/0436/6431/0425/files/jujenanitisomoridifasa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/we_ll_do_it_live.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9576/files/en_honor_a_la_verdad_martha_alicia_chavez.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/71113085419.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_off00007e41.bin
f3cec4eef35e2e9213f3efbccfc4f7cac17a90db671ddd6b39ccf21db165eef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E41 5448 bytes
font_01_sfnt_off000090b1.bin
f4c5b7adbb65b50881d6757de304fc9b97c88e88c8d8366ce28a3a626f9a591e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B1 10268 bytes

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