Malicious PDF — malware analysis report

Static analysis result for SHA-256 721fd7a2203ac9b7…

MALICIOUS

PDF

59.8 KB Created: 2020-08-10 05:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8461f89b82f54b4a3e6edd9c24861660 SHA-1: 1775cf51f2d6b6f0f1eec0e30ce8ec3857db29a8 SHA-256: 721fd7a2203ac9b7abdec8968c785e186bc394efe3412c6c81f1e22366c80092
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=ananda+marga+books+pdf, which is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious sites, likely for phishing or malware distribution.

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=ananda+marga+books+pdf
    • http://files.4seasonsathletics.com/uploads/1/3/2/7/132740951/sajadun_pimabaxu_kumog_newulodanim.pdf
    • http://files.padovecote.com/uploads/1/3/0/7/130776826/5812085.pdf
    • http://files.46ford.net/uploads/1/3/0/7/130738837/9939679.pdf
    • http://suzal.jacksonandhow.co.uk/uploads/1/3/1/3/131383483/4846615.pdf
    • http://batodezi.goldtraining.edu.au/uploads/1/3/1/0/131070420/nesezovu_dadezibala_kurafasisubab_bulazebuzil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/24642887308.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/guvavasogokenofatubi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9214/7366/files/graphene_nanomaterials_fabrication_properties_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/82595467958.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdf
    • https://cdn.shopify.com/s/files/1/0437/2611/0885/files/advanced_and_multivariate_statistical_methods_mertler.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/zikewadozipuniv.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/mirunag.pdf
    • https://cdn.shopify.com/s/files/1/0430/7612/4821/files/air_pollution_in_bengali_version.pdf
    • https://cdn.shopify.com/s/files/1/0430/4096/4759/files/99838145777.pdf
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/nokamosivago.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/57552361321.pdf
    • https://cdn.shopify.com/s/files/1/0433/3076/4968/files/99731720818.pdf
    • https://cdn.shopify.com/s/files/1/0432/6552/3862/files/88531733072.pdf
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/gexama.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_off00009eac.bin
2e65a8511d539fd7b309e6a199f285d176950704996b3efa707953295b7f1f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAC 5064 bytes
font_01_sfnt_off0000afb0.bin
5fa0bdc3f4f8bfd0a7e542836f92b8b0bf79118f6d6fcd980051d708b1951985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB0 10672 bytes
font_02_sfnt_off0000d424.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 4324 bytes

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