Malicious PDF — malware analysis report

Static analysis result for SHA-256 222867b52879af98…

MALICIOUS

PDF

42.9 KB Created: 2020-09-03 10:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 107b13d36c6f752623c1c124c9947964 SHA-1: a5d1c92a9e0a70bfb5863825d1674bb5fce77cae SHA-256: 222867b52879af983a6b10eb79b0633bdf07d5144b14b876f1868ed91f3e9b21
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that the document is designed to host a large number of external links, likely for SEO poisoning or to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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=cho%2527+gath+guide+s8+mid
    • https://static.usrfiles.com/ugd/696b8a_69963d0ff9ec43ffa4989fcea3c01696.pdf
    • https://static.usrfiles.com/ugd/9f06f8_6e03dc761b65417ba9707bc2529b41d8.pdf
    • https://static.usrfiles.com/ugd/cc089a_5ccf61e0d8f84b82a5eb8bdd500d5bf0.pdf
    • https://static.usrfiles.com/ugd/0c268c_d862ef3c8510496fafc5525a67baf0fb.pdf
    • https://static.usrfiles.com/ugd/b9801a_f15c6560074e45d8a27b9d951680b083.pdf
    • https://static.usrfiles.com/ugd/01bc73_4ce3368cec3b4ee5a016cef4b1be5fb5.pdf
    • https://static.usrfiles.com/ugd/93971e_f771af6acc5140f485501afbaad41700.pdf
    • https://static.usrfiles.com/ugd/9734e7_a13dfebdc1fb40bbb7d9cf96cc014e1c.pdf
    • https://static.usrfiles.com/ugd/ca32a8_7681c9dbd98b4fd7804835dbdae8313e.pdf
    • https://cdn.shopify.com/s/files/1/0435/2802/8312/files/jazanizexoxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/kupivuxizokexa.pdf
    • https://static.usrfiles.com/ugd/99afdc_c3624e09650d419e99486921596cfb1e.pdf
    • https://static.usrfiles.com/ugd/cb4a18_ac962d89f8fb4670af666273d3da432a.pdf
    • https://static.usrfiles.com/ugd/51c472_a0abd4b56ff34fc084ffb7b3ad440693.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_off00005edc.bin
d7cf9c728a54d48e2e0dd81810f10aa8d3b9d2e2d53b1e444ba3ceab94188782
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDC 5244 bytes
font_01_sfnt_off0000708b.bin
2d22c98f95994894ce90691cb015c7805f58abd9e79c058f3d7dadca27203999
pdf-font-stream PDF embedded font (sfnt) at offset 0x708B 14908 bytes