Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab6c52a33f335ae…

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 01:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c50f6cf12127879ccaf9f9ddac27ff5e SHA-1: f5cf9aa5bbd449306bc3510cbcb1e5e998721a14 SHA-256: 4ab6c52a33f335aecac87a726399de410aaa958c038be6d6ef5c97a8d9596970
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to drive traffic to the malicious redirector. No scripts were extracted, but the presence of numerous links points to a social engineering attack aimed at redirecting users 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.cc/wix?keyword=the+longest+ride+nicholas+sparks+ful
    • https://static.usrfiles.com/ugd/b8c837_b6ade1eebc8242aba3474f90d177a413.pdf
    • https://static.usrfiles.com/ugd/b8c837_eaec37f21ff64c6ca47c91c912292bbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c6cfa7d984a4ac385406df5d41039e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1a2b99b75e348ca8fa1a0c5f35bb275.pdf
    • https://static.usrfiles.com/ugd/b8c837_4810765cda42431fb55a6e2685f164f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_db36a262cf0345a29e1921386e480fe3.pdf
    • https://static.usrfiles.com/ugd/b8c837_869ac493c09145dba22f0521491ed8c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_72115776a4274be4a9a49a3aebd463b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ecf4f1b885f4d6d99c7b1653b0db2a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2826ded81f9641cfb74f3207228d1a8c.pdf
    • https://cdn.shopify.com/s/files/1/0440/1355/1781/files/printable_calendar_pages.pdf
    • https://cdn.shopify.com/s/files/1/0433/7798/3653/files/86988206268.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/ford_ranger_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/pakistan_economy_mcqs_with_answers.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_off00005fc3.bin
f36a938f6c2e849d1b4793ddeb223e238bdf6184ac72c2f2b489ff36c571fb4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC3 5428 bytes
font_01_sfnt_off0000723a.bin
7ed0c1c69f433cae02fc31f586a59fb863f3a0a6f2d95d031c0fd5eaa63b013c
pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 10404 bytes