Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bc2e7fbb38b866…

MALICIOUS

PDF

35.2 KB Created: 2020-08-25 00:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 139e4ccd0937ef513e74a7ab03ce45cf SHA-1: b0a01bf1671e50c4d43cb3e3dd2a17d7f8c0af89 SHA-256: e6bc2e7fbb38b8668e666a7c2fa393da53c6ca0b457648893ab16149fd30aae7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDF files, which is indicative of a link farm or SEO spam campaign. Crucially, one of these links redirects to `https://ttraff.cc/pify?keyword=gilbert+sheetmetal+engineering+ltd`, which is known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains the malicious redirect 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/pify?keyword=gilbert+sheetmetal+engineering+ltd
    • http://files.bajabluediving.com/uploads/1/3/0/8/130814706/vidaxegexib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/history_of_biomass_energy.pdf
    • https://cdn.shopify.com/s/files/1/0463/3110/1346/files/bobby_s_burger_palace_allergen_information.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/mapurafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/28088424225.pdf
    • https://cdn.shopify.com/s/files/1/0463/1511/0565/files/93718507783.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0446/7798/8505/files/khadya_suraksha_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/cathodic_protection_manual.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_off00004981.bin
6e31f0c0e467df28d8667858383a9582fadfc31f4e96f92b23cabe6b1b01e494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4981 5408 bytes
font_01_sfnt_off00005bb9.bin
0f704736e7c7f494a9ec3986da267025bc609bf3093f96c008f97049091638cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB9 10804 bytes

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