Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e93743a01490410…

MALICIOUS

PDF

48.0 KB Created: 2020-08-21 07:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ff7c5535a0589c5489bdc2ad77c90d0 SHA-1: 811a85e9f58199115d4281ad88706d62d552be60 SHA-256: 0e93743a01490410e8907ba51948cba9dc97b8fb9fb8e9a636dfebfb36b793b5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document body itself is heavily obfuscated but contains the malicious URL and several other URLs, many pointing to Shopify, likely as part of a link farm to improve SEO for the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=business+ideas+in+telugu+language+pdf
    • http://files.acracademy.com/uploads/1/3/1/6/131606175/jinedaxudo_wibekigikubemat_nizemokitor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/toyota_corolla_parts_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/jejetigudebiketoxik.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/wedipikutajigum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/21785361804.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/wasumali.pdf
    • https://cdn.shopify.com/s/files/1/0437/8578/1397/files/kelasepudilavuw.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/bovikuriguludajifizo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7778/8057/files/facies_acromegalica.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/81231774295.pdf
    • https://cdn.shopify.com/s/files/1/0430/7668/1882/files/4_basic_language_skills.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000579d.bin
5de580712d2248cc043cd99705cf37d9d683de816c52a954c21cf66b95d70fd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x579D 5160 bytes
font_01_sfnt_off0000693b.bin
dc3945462ad4a8cb5c2df9eefc9c10f6ed2452771fff00e38c2a90fce4ca6314
pdf-font-stream PDF embedded font (sfnt) at offset 0x693B 15924 bytes
font_02_sfnt_off0000912e.bin
f7aa2e07931e7a8585e5380514e473e55cf777050379683775b9760fd39c21d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x912E 9852 bytes