Malicious PDF — malware analysis report

Static analysis result for SHA-256 d972d67aa6a43a14…

MALICIOUS

PDF

45.4 KB Created: 2020-08-29 23:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f62fe180c88cb296ada91d2ec4cf6b47 SHA-1: ffe746dcd1f240bbac0195151256ce44925967f2 SHA-256: d972d67aa6a43a143cfe968559d7784157a6ab1a6f77d6ab3d97efce9e5c1177
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, likely for SEO poisoning or to distribute malware. 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.cc/wix?keyword=aquamatic+pad+definition
    • https://static.usrfiles.com/ugd/b8c837_6488a0cfe728435b831603c2fb947484.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1b3d97bc48f497abe3862f8b9e863d5.pdf
    • https://static.usrfiles.com/ugd/804ff6_ded916c4ec8e42e3a8f89092b7495e5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_16b52d1e7e444b0396e282047c1fca6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_df0594bf9dcc475f9739fd2f7802f66a.pdf
    • https://static.usrfiles.com/ugd/b8c837_415bde64a0bc42d9af62f05bd185224d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b63e8f85dcc44d25b9d1fcad1a8082d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c687637e74f74d27a788dbd22bed4b5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d364dab46e24a209039d58dd30071b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d839e889e1743e389a3da0ab895b5a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e9eb2a86294556bd47030af114e33a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdfd312934db4f7abe1f82318d54d2ac.pdf
    • https://cdn.shopify.com/s/files/1/0438/1527/2605/files/90126843029.pdf
    • https://cdn.shopify.com/s/files/1/0462/8761/8209/files/anatomy_of_piriformis_muscle_and_sciatic_nerve.pdf
    • https://cdn.shopify.com/s/files/1/0433/2604/6362/files/tokum.pdf
    • https://cdn.shopify.com/s/files/1/0437/0599/1322/files/mugofajiwekawilojorupanud.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_off000074c3.bin
138c0c5ac8162e1ed4ad18ddbb60cb5b94b45cd6ea56801ec7f4bd170d3e61ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C3 5108 bytes
font_01_sfnt_off00008616.bin
fdb73c87de375c4adaab8df75e7b7d81e1cb2c656079ec254503ea389c06719d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8616 10292 bytes