Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e3ea8f9a29c3cc…

MALICIOUS

PDF

45.2 KB Created: 2020-08-22 01:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d8151201a6327d7a0308e3154213130 SHA-1: 11ec74f065f440ad5cf74894c21dc9d435f54539 SHA-256: 76e3ea8f9a29c3ccf81fed6b3b8d76ef44eee7b6150c36fea866c4436e367493
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on Shopify and other domains, with one primary URL identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the PDF is designed to lure users into clicking malicious links, likely for phishing or to download further malware.

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.ru/pify?keyword=importancia+da+alimenta%25C3%25A7%25C3%25A3o+saudavel+na+escola+pdf
    • http://wexigi.fallonsgourmet.com/uploads/1/3/1/6/131637016/gexazavuxajana.pdf
    • http://files.fifteenmoremins.com/uploads/1/3/1/1/131164081/2467800.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/xuzemaginikixelotom.pdf
    • https://cdn.shopify.com/s/files/1/0462/3892/4960/files/99024394558.pdf
    • https://cdn.shopify.com/s/files/1/0448/3081/8461/files/56435217339.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/11268182040.pdf
    • https://cdn.shopify.com/s/files/1/0427/4490/5884/files/lubejulemanonafonal.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/87329766738.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puwojadudabub.pdf
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/simplifying_rational_expressions_with_fractional_exponents_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3830/8512/files/complete_catechism_of_the_catholic_church.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/workflow_developer_guide_in_oracle_apps_r12.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/zotevideralol.pdf
    • https://cdn.shopify.com/s/files/1/0460/2911/1455/files/55011180483.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c22.bin
2b49c4cb741e82d41d0fd6e1a8da439748d2e6758a998ccc51319c4777ede0bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C22 5800 bytes
font_01_sfnt_off00007ee0.bin
4797eb6f95c5c7c5b3d640ef2605a9baf11010389cd4cc80f6f7b4a6571a6116
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE0 12456 bytes