Malicious PDF — malware analysis report

Static analysis result for SHA-256 8411d7445d38b55a…

MALICIOUS

PDF

34.2 KB Created: 2020-08-16 22:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18e3b5d8a4b09fbc47e797d21c999b93 SHA-1: ea13edb499000f8f807bcf8ad52eddc1f21cdee8 SHA-256: 8411d7445d38b55a178a109c348fbc3b7d65969841a5c90ad0b3ce5f8d6d84bf
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, ttraff.com, which is designed to lure users to malicious content. The document body, though partially corrupted, contains text related to mathematical worksheets and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic to distribute the malicious content.

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=finding+circumference+diameter+and+radius+worksheets
    • http://files.bakersfield-signs.com/uploads/1/3/0/9/130969967/2158686.pdf
    • https://cdn.shopify.com/s/files/1/0440/8174/1976/files/maxiwuvejenamadanol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/wifimosamozisodupikodef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/jevazejajudedijaponelosal.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/gazedo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9269/files/tozixolawenesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4924/6110/files/tipos_de_graficos.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/22361802661.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/23976784131.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/3559649608.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/zoxuwetilesumurevoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/1356/0727/files/bozotogubekagozim.pdf
    • https://cdn.shopify.com/s/files/1/0430/9476/9821/files/lepogafavofaze.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004868.bin
6e99769b7ca8b5395cc642422b2b282207e84b1157ab8ffdb5ba4aa3b783f21d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4868 5512 bytes
font_01_sfnt_off00005b0b.bin
544ca8a8dfc01043efe60072a9e31731259253be4b7d04f914d6d2e6332a63ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0B 9600 bytes