Malicious PDF — malware analysis report

Static analysis result for SHA-256 149350d687df22c3…

MALICIOUS

PDF

45.3 KB Created: 2020-09-16 17:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65951a06c185805add02413765371867 SHA-1: 3a3fd0f1693322191c7f3ac2a7ca4890f94e0db0 SHA-256: 149350d687df22c33422cdd074d87a55a8b520728746b51de52bc3bb33f012c3
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a free download for an environmental economics PDF, which redirects to a malicious domain. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious redirector infrastructure and for containing a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. No scripts were extracted, but the embedded link is the primary indicator of malicious intent.

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.club/wix?keyword=charles+kolstad+environmental+economics+pdf+free+download
    • http://files.thedreamplace.store/uploads/1/3/0/9/130969322/5278631.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0557/4311/files/tebofexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3969/files/53344541863.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/57770164236.pdf
    • https://cdn.shopify.com/s/files/1/0430/4486/4149/files/borderline_personality_disorder_scale.pdf
    • https://cdn.shopify.com/s/files/1/0435/1652/6752/files/bright_field_microscopy.pdf
    • https://cdn.shopify.com/s/files/1/0461/8708/5987/files/74817491545.pdf
    • https://cdn.shopify.com/s/files/1/0430/0836/0611/files/ketogene_dit_einkaufsliste.pdf
    • https://cdn.shopify.com/s/files/1/0461/4950/1091/files/ea_cricket_19_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2383/files/mazik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0356/7515/files/bononakuzojexujuwuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/49331653038.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_off00006928.bin
be73ed4fa1b07ee40b91c55d058feb066775ed8c2ca98e05a41e1a0e2f61babb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6928 5516 bytes
font_01_sfnt_off00007bcc.bin
bd736f86e9011b6a8794b2ce119af8942bd147ec63917d3c0293d085ec5f585e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCC 14380 bytes