Malicious PDF — malware analysis report

Static analysis result for SHA-256 423c4976358f201a…

MALICIOUS

PDF

36.0 KB Created: 2020-08-16 22:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbc73b980815c3e998a0015331c88de5 SHA-1: cd54f55461be08397159b394467e257091f7308f SHA-256: 423c4976358f201a86e39c4e95ab5ab9d9d9949308cb9f4399b37837b0d87da5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to malicious content. The PDF also features a large number of external links, many of which are hosted on Shopify, suggesting a link farm for SEO manipulation or distribution. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious redirector links is sufficient to infer a phishing or redirection attack pattern.

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=currency+word+search+answers
    • http://daxutirux.onemanhealthsolutions.com/uploads/1/3/0/8/130814297/damogojagukiriwa.pdf
    • http://files.scratchsanantonio.com/uploads/1/3/2/3/132303230/9723636.pdf
    • http://files.cavumcloud.com/uploads/1/3/1/6/131636825/747df.pdf
    • https://cdn.shopify.com/s/files/1/0434/4823/8242/files/17642755935.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/dimukipomab.pdf
    • https://cdn.shopify.com/s/files/1/0434/6449/1174/files/fogitaxupowowigekuvatijiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9281/1669/files/55194491674.pdf
    • https://cdn.shopify.com/s/files/1/0429/4351/2732/files/curriculum_vitae_sample_for_undergraduate_students.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/89925121453.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/mebomunesewalaxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1664/0917/files/too_much_happiness_alice_munro_download.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004358.bin
ec58ec14e0135d920933b8c3e55568b3bd22c89f9dde0e3aa4e7bbce3fda8085
pdf-font-stream PDF embedded font (sfnt) at offset 0x4358 4964 bytes
font_01_sfnt_off00005430.bin
dcb63c206a513f6d88caf82e67b02aa999623243a078e47f7b3aa11b0e864112
pdf-font-stream PDF embedded font (sfnt) at offset 0x5430 9752 bytes
font_02_sfnt_off00007588.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7588 4324 bytes