Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d653f2a46897cae…

MALICIOUS

PDF

43.2 KB Created: 2020-08-13 23:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47565a8962b55e478f0100b200ff7bf6 SHA-1: 454a90bc9bd9994994620d0b5429c59c0fb9014c SHA-256: 6d653f2a46897cae61a18c109afb3289694bef71d3947899a2ead30a6b3bd688
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, https://ttraff.com/wb?keyword=circling%20and%20writing%20compound%20sentences%20worksheet, is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious infrastructure.

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/wb?keyword=circling%20and%20writing%20compound%20sentences%20worksheet
    • http://files.fourthquarterdigital.com.au/uploads/1/3/0/7/130776462/bb433b.pdf
    • http://files.ribbonsbyfir.com/uploads/1/3/1/3/131383247/vapebojokajol_wudesufodipe_lafopijogijiz_runumu.pdf
    • http://files.whbaptist.org/uploads/1/3/1/4/131406234/mofoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0972/7912/files/dawn_of_war_tau.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/austria_road_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/0467/4727/files/74327953620.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/fedaturejip.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/bumedopivujuge.pdf
    • https://cdn.shopify.com/s/files/1/0447/8402/5751/files/skf_double_row_cylindrical_roller_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7725/files/xxx_passwords_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0428/9724/4316/files/math_teacher_resume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/random_string_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/putomosufotugusib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/acrostichum_aureum.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/bufedazezegagal.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/bevebutege.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_off000064a4.bin
6ec927d756d539269030b3130c01325633bfe0deb5aa93851b7b04dfc9beaa66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 5548 bytes
font_01_sfnt_off00007759.bin
d7dc98e4661834e2483bba747017b341a6a9eb9b05fb2a3575b47cdce8e2f2c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7759 12544 bytes

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