Malicious PDF — malware analysis report

Static analysis result for SHA-256 4089b9a24d9b022e…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 03:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9548224bb1741a1dbc402c8af212a9d SHA-1: 2ae77f8c3f6f84478ef0773d08dcc4a4c1c4d5e0 SHA-256: 4089b9a24d9b022ee02a22430cc76a780335bcd43ceb0bad388c2e8664cab0a6
152 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.com, which is designed to lure users into clicking on further malicious links. The document body, though heavily obfuscated, contains the URL that triggered the heuristic, suggesting a phishing or redirection attempt. The presence of numerous other PDF links, many pointing to static.usrfiles.com, indicates a potential link farm or SEO manipulation tactic to obscure the malicious redirector.

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/wix?keyword=formulario+para+solicitar+ley+300+pdf
    • https://static.usrfiles.com/ugd/79e0dc_0479ebab87ea4c0e85177124a09b1b67.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_c614d1a396d14e898923ed930776cd7c.pdf
    • https://static.usrfiles.com/ugd/493135_e34e12323b1248feaca239c98e572022.pdf
    • https://static.usrfiles.com/ugd/b7ed05_79bf40a8d77748e2af37a4b2e5ce49ca.pdf
    • https://static.usrfiles.com/ugd/3826db_21f67ce0155a4f9bacd8dfc42fa0130d.pdf
    • https://static.usrfiles.com/ugd/b8c837_77e69f4e66194f5b92dade12dcc9cb43.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/algebraic_properties_of_equality_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0615/5173/files/the_access_bible_new_revised_standard_version_with_apocrypha.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6578/files/mario_bro_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/9272029024.pdf
    • https://static.usrfiles.com/ugd/8de238_7c6aa3112f52458fb9bea2e901269390.pdf
    • https://static.usrfiles.com/ugd/b8c837_f23478dd962a49229d888a6a32ad5557.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfddc23b676d495b92b6939aaaf8531f.pdf
    • https://static.usrfiles.com/ugd/b8c837_43deaa3efff0478aaac26c00240fc6a9.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_off000059df.bin
58ea129cb42f61aed7a013306cc9a0c5568d10a4c5abb42a9b1154040f08dd2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x59DF 5664 bytes
font_01_sfnt_off00006d17.bin
e4b01acb10e6cb2b120b04e708274a1181c9924315ffd20be7b3aa24ab8cfdda
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D17 11184 bytes