Malicious PDF — malware analysis report

Static analysis result for SHA-256 053e1bed1939d2b9…

MALICIOUS

PDF

55.4 KB Created: 2020-08-20 21:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eef4551692ba0e0be72888bbc99ba2ca SHA-1: 352b644b6cd9246176ad92f9ad6cfcab3dcf9d4b SHA-256: 053e1bed1939d2b99861d5dd323719ce71ffa626ef82bb9d6091f49a110d4051
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a user guide, which is a common phishing tactic. The ML classifier strongly indicates maliciousness, and the embedded URL points to known malicious infrastructure. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

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=myeras+residency+user+guide+2020
    • http://dodota.thehipaaman.com/uploads/1/3/0/9/130969953/tifapoxujerakujuwol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/89797660113.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/atomic_structure_and_the_periodic_table_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/3115/8175/files/el_capitan_homebrew.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/zesixarus.pdf
    • https://cdn.shopify.com/s/files/1/0447/9506/8567/files/crimes_against_humanity_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/9234/4999/files/77825935576.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4519/files/50631511724.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/annenmaykantereit_barfu_am_klavier.pdf
    • https://cdn.shopify.com/s/files/1/0445/3980/5855/files/p90x_nutrition_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5224/3861/files/after_school_africa_app.pdf
    • https://cdn.shopify.com/s/files/1/0439/9074/5246/files/ribivukev.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5512/files/depopukurozonipivoxosis.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_off000099cd.bin
aaa3d4e9edde1fcbad49cc063eaa877976d26c6f9b8206f831bae5a8ee42064e
pdf-font-stream PDF embedded font (sfnt) at offset 0x99CD 5456 bytes
font_01_sfnt_off0000ac70.bin
3b4362104290cab396d25b2197d7a47c67ecf6195d87300c0a58a5c470864573
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC70 10732 bytes