Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36dcb0d9c0d3da4…

MALICIOUS

PDF

53.5 KB Created: 2020-09-02 07:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 119831985374043e41207fd3739ed000 SHA-1: 090f8a3ec02de8872c01394e8cc18821c91e2e26 SHA-256: c36dcb0d9c0d3da41f4cccb3a03c54c3dcd4a0ecc7f6b6bda88818cec0cfa6b0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=minecraft+avatar+creator'. This URL is presented within the document body, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many of which point to Shopify and static.usrfiles.com domains, though the primary redirector is the most concerning IOC. The ML classifier strongly indicates maliciousness.

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.me/wix?keyword=minecraft+avatar+creator
    • https://cdn.shopify.com/s/files/1/0433/9243/4326/files/49637804885.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/3289942185.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3635/files/fm_21_20.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/tunukajijaramesagiduget.pdf
    • https://static.usrfiles.com/ugd/c1615c_e2e033166f084bbf81f7a4da22f9ac85.pdf
    • https://static.usrfiles.com/ugd/6260fe_559a14ca6d5146fc92f2202d407e95ed.pdf
    • https://static.usrfiles.com/ugd/48d9a1_9cf05a411501447ba41f0baea4d975c8.pdf
    • https://static.usrfiles.com/ugd/8c0e65_7a5c2fe7646f4617b1f5245a2f536cb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_da91eb6cea424e249b9b5cf871653045.pdf
    • https://static.usrfiles.com/ugd/824332_7ac64c7ae5bb49319f0df46bd401ead1.pdf
    • https://static.usrfiles.com/ugd/b8c837_714e4135be8f4c96a179b8141231f395.pdf
    • https://static.usrfiles.com/ugd/c3f59f_4fadfba615874d33bc1aa437ae20e4cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_bedd8e080bf247bbb2d10ff3f6795f97.pdf
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/mathematics_worksheets_for_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0293/files/32793009977.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_off000094d7.bin
152abecbd9031cc27af953a7b345db5e9e87f1da0bc5778a1db7505ef52be71a
pdf-font-stream PDF embedded font (sfnt) at offset 0x94D7 4728 bytes
font_01_sfnt_off0000a512.bin
f51186d7730949e7c30893f54ad6b4b9b1936c120cf2d606a6b7894419803b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA512 10668 bytes