Malicious PDF — malware analysis report

Static analysis result for SHA-256 051fca3fb8e63038…

MALICIOUS

PDF

49.5 KB Created: 2020-08-30 23:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0be46f9d9159e510981f7a9452064b62 SHA-1: 4831399ae82de4c1c9fe9129dee95dee1b4bb152 SHA-256: 051fca3fb8e63038bb0ad1611a258aae05180f416ac6a5c3d1715e4becb2fc2a
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL, indicating a likely attempt to drive traffic to malicious content. The document body, though heavily obfuscated, contains the same lure text and redirector URL as found in the heuristics, suggesting the primary purpose is to trick users into clicking the malicious link. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence point to malicious intent.

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.link/wix?keyword=mickey%2527s+christmas+carol+full+movie+online
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/902d29_db7a56a31cb74a1d8d95b612db92bb56.pdf
    • https://static.usrfiles.com/ugd/f84671_4823ff2affa24a289103bc18818b46cf.pdf
    • https://static.usrfiles.com/ugd/576447_3499b12b01014db1bd8d705ba2eca279.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7b30d30360941fc9ee6229c55a5721d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a89861ec2d0148a5bc7c1a34fe376d43.pdf
    • https://cdn.shopify.com/s/files/1/0462/0084/8537/files/vupiwadu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/hanuman_chalisa_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1283/1907/files/sorting_algorithms_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/15640055513.pdf
    • https://cdn.shopify.com/s/files/1/0437/7971/9330/files/bilinif.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/dakarud.pdf
    • https://cdn.shopify.com/s/files/1/0434/2870/8519/files/95409850231.pdf
    • https://cdn.shopify.com/s/files/1/0440/2675/7270/files/active_directory_federation_services.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_a0d7ef56ad684510a0ad827886928a49.pdf
    • https://static.usrfiles.com/ugd/b8c837_394a5068d7e449e1b1c9c88527e82da4.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_off00008319.bin
e6e07912e2a22f0c672d1122d30a37bcb879f2c1780d028e3a6517f42fb6a3f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8319 5388 bytes
font_01_sfnt_off0000955e.bin
054db9939eaff6b1f5c2c8cb73b16e49432c583b9ad74c8e4e413d26020ec904
pdf-font-stream PDF embedded font (sfnt) at offset 0x955E 10372 bytes