Malicious PDF — malware analysis report

Static analysis result for SHA-256 048cd591138460d1…

MALICIOUS

PDF

38.2 KB Created: 2020-08-14 11:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cf86adea6d41466c1a5b8341cb68448 SHA-1: fabc5b2fbaa1ccfa2ad6860d6b65cc32ab75ff7f SHA-256: 048cd591138460d150e75083b445c08d58fd25fffe897ff4bf88c031d4a1f50d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded URLs, many of which point to a link farm designed to obscure the ultimate destination. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The presence of a link farm and a redirector suggests an attempt to lure users to malicious sites, 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.cc/pify?keyword=banjo+party+marathi+song
    • http://files.gladwincofc.org/uploads/1/3/1/4/131437736/45ef0fb386.pdf
    • http://bizewo.bengillen.com/uploads/1/3/1/3/131383483/tanogimixiwu-bikuk-vififisoburopor.pdf
    • http://files.mhmontessori.org/uploads/1/3/0/9/130969801/4cd664ded8edbd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/sadikakobofonimasi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/lettering_calligraphy_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/4283/1522/files/mirete.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/39_clues_maze_of_bones.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7968/files/air_source_heat_pump_systems.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/miregesegetum.pdf
    • https://cdn.shopify.com/s/files/1/0440/1309/3029/files/3_digit_addition_and_subtraction_with_regrouping.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/types_of_assistive_listening_devices.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/monitoring_and_evaluation_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/barcode_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xugifewelogukepebokiz.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_off00004b91.bin
9588cd339e1ef1c68d1f7d97f8f252b1804bd8ec7727c7d29c0b9fd456023ef9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B91 5428 bytes
font_01_sfnt_off00005dec.bin
04812b50cd47fbf688e8ca1a5db0df4e096693ac5b9d9fea31194d96f5639fd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEC 13968 bytes