Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc8358203aff76a…

MALICIOUS

PDF

44.0 KB Created: 2020-09-17 17:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 262b9e3a3d045c729a03aa16c22e551d SHA-1: fccd1554f3ea756fc1f834e7489b9a4f983aa47d SHA-256: 9fc8358203aff76a96017e278037216c2520537cde0a2e8bcf90f43e707505d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF contains a large number of embedded links to other PDF files, a technique often used for SEO manipulation or to host malicious content. One prominent link redirects to a known malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=ffxiv+requiem+for+heroes+zenos+fight
    • http://files.codiakacres.ca/uploads/1/3/1/6/131637131/figep.pdf
    • http://gawebix.musicofpraises.com/uploads/1/3/2/3/132302978/gebikubudawa.pdf
    • http://files.maltacommunitychurch.com/uploads/1/3/0/7/130739119/91b83f7e8055.pdf
    • http://files.lkonsite.com/uploads/1/3/1/8/131872079/sulapemexidubelon.pdf
    • http://files.sherrysmithyogamassage.com/uploads/1/3/0/7/130776542/4654802.pdf
    • https://466a2628-5129-450a-805e-2d56f1421fed.filesusr.com/ugd/dcf9ad_a78ebe4eecee477baed2037bb69cc5aa.pdf?index=true
    • https://cd26fe13-91a0-4f0c-8613-4e9120c3f3f2.filesusr.com/ugd/de3d83_1f07480de376416aaefd4b1c70e0fafe.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/3690/1527/files/el_viento_distante.pdf
    • https://cdn.shopify.com/s/files/1/0433/7935/9900/files/us_work_permit_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/photolithography_steps.pdf
    • https://2d283007-fab5-465a-bda0-34a0b55cf302.filesusr.com/ugd/2c608b_2d9ed0b3e22947b28bf0af6f91a7e95a.pdf?index=true
    • https://f32ca49e-2f99-45c7-814e-29d1d4cfa3bf.filesusr.com/ugd/03dcd4_1a778148df094b9ab7fde03e43a5bc9f.pdf?index=true
    • https://8afa409f-6505-4877-8fd7-8afff91c93db.filesusr.com/ugd/f59309_645db6a67b2c41bb9a90021adf889c4a.pdf?index=true
    • https://d5dc6f41-24b4-44d2-ac17-4d3b29eaab65.filesusr.com/ugd/44b221_2d0f13a0667a47c8a0b922444629ca24.pdf?index=true
    • 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_off00006cd7.bin
c5ff3a6d3d641acb38bb74ed6838fe4f5c56f202afacf874ab540d57c1842026
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD7 5200 bytes
font_01_sfnt_off00007e78.bin
f1337cf25df5ab20b241792b71e9747130e690350338bd00125ea787eb780588
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E78 10776 bytes