Malicious PDF — malware analysis report

Static analysis result for SHA-256 55efe80228ebfa1f…

MALICIOUS

PDF

42.7 KB Created: 2020-08-06 23:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d12e1c15dc686a73ba043ca1a03d1898 SHA-1: eb3669a16255faf260d06487b56b8464b012790c SHA-256: 55efe80228ebfa1f0274bcd64a83cb1eadb357253bc0275f8714495462cac99d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document body and embedded URLs suggest a lure related to academic or research papers, likely to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=jurnal+bacillus+thuringiensis+pdf
    • http://files.bewellacupunctureclinic.com/uploads/1/3/1/0/131070452/pabunefete.pdf
    • http://xuxapovom.garmonater.com/uploads/1/3/0/7/130739777/wopifetorekoriba.pdf
    • http://files.topshelforganizers.com/uploads/1/3/1/8/131856646/juvog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/5447763040.pdf
    • https://cdn.shopify.com/s/files/1/0434/3834/2311/files/inter_1st_year_chemistry_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/2317981596.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/lizijob.pdf
    • https://cdn.shopify.com/s/files/1/0440/6365/4040/files/advanced_excel_formulas_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/importance_of_data_analysis_in_research_process.pdf
    • https://cdn.shopify.com/s/files/1/0428/5317/1356/files/lijetejugikuwiwenivadi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/juxikijidodujatusiredonen.pdf
    • https://cdn.shopify.com/s/files/1/0432/0106/9220/files/30715534983.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/71708695954.pdf
    • https://cdn.shopify.com/s/files/1/0434/8238/2502/files/10193382582.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_off0000674f.bin
e4ff8eefa58316a40984d424f02eca8e6196bb9165f2fc0c75c4bee86545358a
pdf-font-stream PDF embedded font (sfnt) at offset 0x674F 5544 bytes
font_01_sfnt_off00007a1b.bin
c483e1225b76a401ac315ba37c6410c91a5df64c5080344af3e87da7af1e6524
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1B 10576 bytes