Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aa75db86f5d05f…

MALICIOUS

PDF

41.2 KB Created: 2020-08-19 10:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0a3d3e8ca2e185d6c07b8347a0cff2e SHA-1: e61e32859e988e628f821936924b8b2253619461 SHA-256: 72aa75db86f5d05fa34f78148070f9e903135566e378aeb010533dbb6e78af93
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though partially corrupted, contains text related to 'free antivirus' and the malicious URL, suggesting a lure. The presence of many external PDF links, some pointing to benign Shopify URLs and others to unknown domains, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution 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.cc/pify?keyword=bach+khoa+antivirus+mien+phi
    • http://files.galleryodin.com/uploads/1/3/1/0/131070918/5627222.pdf
    • http://files.foodloveblog.com/uploads/1/3/1/3/131380868/vosirijofa.pdf
    • http://files.vanengelsdorpbeelab.com/uploads/1/3/1/3/131381640/dfbbdb88361dd1.pdf
    • http://files.soulsanctuarydance.com/uploads/1/3/2/8/132815123/sexiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3443/files/elementary_surveying_an_introduction_to_geomatics.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/5837356281.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/5346919281.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/number_line_to_1000.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/sawadalifelibesuwavo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/pancreatic_pathology.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/wanoxoduxaraketepewekavaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9200/files/xizimadotegasowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3282/files/certificate_of_completion_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/0952/2339/files/french_vocabulary_lists_by_topic.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_off000056cc.bin
330f46eb2b0671e0dd0196b58b3d2b19dd2b193c716f67d8e08933819db2ff6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56CC 5196 bytes
font_01_sfnt_off00006846.bin
57f4e78c76e491a456d5da33178c188dfe4d85aab535ed4a4437078207eb64d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6846 9844 bytes
font_02_sfnt_off00008a08.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A08 4324 bytes

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