Malicious PDF — malware analysis report

Static analysis result for SHA-256 71748d03daf0c702…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 23:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 977c0ab04b28845acc1060ce2790b8c2 SHA-1: 3178a3e27407a10454422bbc453f0b41e7af6e16 SHA-256: 71748d03daf0c702c1299a429732f4067cb97ac1488daafd2f0fd8676926b72d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=escuelas+lancasterianas+en+mexico+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious destination. No scripts were extracted, but the embedded URL itself is the primary indicator of compromise.

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.ru/wix?keyword=escuelas+lancasterianas+en+mexico+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4619/8683/files/friends_from_college_netflix_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/vefew.pdf
    • https://cdn.shopify.com/s/files/1/0434/9450/6661/files/76621140275.pdf
    • https://static.usrfiles.com/ugd/314c35_1fc02bb9103c48cdb36a1ddbe19beaac.pdf
    • https://static.usrfiles.com/ugd/63d3ad_8703eab5daa2451c85cded75ace8da95.pdf
    • https://static.usrfiles.com/ugd/b8c837_c612aa6c3eb24ee98c48caaadba5c8bb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3899/files/spring_boot_reference_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/crafting_guide_mod_1._12._2.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/61781316963.pdf
    • https://cdn.shopify.com/s/files/1/0435/9903/6579/files/duwemosapivilufitarerul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/86477918810.pdf
    • https://cdn.shopify.com/s/files/1/0438/2641/3725/files/karel_j_robot.pdf
    • https://cdn.shopify.com/s/files/1/0437/3482/7162/files/metso_jaw_crusher.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_off00006772.bin
386e0df6b1e38b69c7d88a54d222b03f1274aacea63bb407324a6d4442f496d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6772 5328 bytes
font_01_sfnt_off0000797a.bin
bc1c614e352a5c743176d1183ddfd5617184305a9e01f937ed5d0ddfc2940a84
pdf-font-stream PDF embedded font (sfnt) at offset 0x797A 11296 bytes