Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24e4d539b2b8669…

MALICIOUS

PDF

42.9 KB Created: 2020-09-05 07:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 158f54a4c5e2863ad5d2d34626c6bf22 SHA-1: b46db65f8f4f30f69bce6af3b62a7856e96f7278 SHA-256: e24e4d539b2b86699539a0aeb97eca82947951d17d969b4f7e63f6a3de8551c6
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to static.usrfiles.com, which is likely part of a link farm. One of the primary links, https://ttraff.me/wix?keyword=attribute+in+html+w3schools, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting the intent is to drive traffic to malicious infrastructure.

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=attribute+in+html+w3schools
    • https://static.usrfiles.com/ugd/b7306e_972a8115943546a68b85ecb48e1683e0.pdf
    • https://static.usrfiles.com/ugd/6116da_1f002b14974e4b269eb9db1abf60ebdb.pdf
    • https://static.usrfiles.com/ugd/6cf804_02d36cad44e34a7a98292d7cee80c3d6.pdf
    • https://static.usrfiles.com/ugd/e643da_847b4ecf07ad4c1f92beb61357e56e70.pdf
    • https://static.usrfiles.com/ugd/04e6f9_72fe27a5224b4cf1ac3a1358e3997edb.pdf
    • https://static.usrfiles.com/ugd/9ea91e_a0ab7e93156048578ec088b4e597be7d.pdf
    • https://static.usrfiles.com/ugd/10b11f_a055ef0220b944a9a9268dd30c9b2ffe.pdf
    • https://static.usrfiles.com/ugd/87d215_58d2417268804a77bd34f20b300e4469.pdf
    • https://static.usrfiles.com/ugd/4542d9_2641be4b76d44086b56fa4b9ae027adf.pdf
    • https://static.usrfiles.com/ugd/b48b60_e0072a23e783464d802c4edfb3d2dde6.pdf
    • https://cdn.shopify.com/s/files/1/0462/3109/3397/files/blip_and_blop_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/3920/2197/files/awaken_the_giant_within_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/10364873666.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/essential_mathematics_for_economics_and_business.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/36312423021.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_off00006180.bin
33ab7e5f5447889b7b2a29564bcde31a71a206ddbbbd1bb69543b1623ea4dc77
pdf-font-stream PDF embedded font (sfnt) at offset 0x6180 5212 bytes
font_01_sfnt_off0000732a.bin
eb8bbfa9e523bcc3c6d0056f804d3cb6e2b74c23ef71822b55b5987bebc498a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x732A 13804 bytes