Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cf7355f6e93f96…

MALICIOUS

PDF

101.1 KB Created: 2020-08-09 14:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a155c45621d2f6bf413bab44d3311ef SHA-1: c340fc7187f104db847d4b91fc7ade3f56055c11 SHA-256: 01cf7355f6e93f964050473c1df4a10bc9945af9aea092e3ea8aa4b96dd28f64
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This suggests the primary goal is to direct users to malicious infrastructure, likely for further exploitation or phishing. 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.ru/pify?keyword=manual+de+economia+politica+nikitin+pdf
    • http://files.turner-mrs.com/uploads/1/3/2/6/132696598/3278026.pdf
    • http://files.wilcoprevention.org/uploads/1/3/1/4/131437740/29b296.pdf
    • http://muvefunef.revartmontana.com/uploads/1/3/1/4/131437363/vumuvuvapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/geez_amharic.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/91522477450.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/89450628295.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/76484107005.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/18321640216.pdf
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/engineering_economic_analysis_12th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/89095952123.pdf
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/natoruvurom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuzizurogepibisomagin.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/add_text_to_acrobat_pro_9.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4992/files/muwogupulitexitozu.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_off00013f67.bin
b4cd41a36fb8dc8930428bcddbe949c1ddcf6f70289c2ff8ba9d122323daf456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F67 4976 bytes
font_01_sfnt_off00015040.bin
1b500d6336d171bad7447c2d3e800848a53704269e5c9e8c31e870ee5121e509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15040 12772 bytes
font_02_sfnt_off000178fb.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178FB 4324 bytes

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