Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1bdbbeb091d97e…

MALICIOUS

PDF

38.3 KB Created: 2020-08-27 16:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9f32f3a436743feb423aa1d7552feba SHA-1: a5d5106d175d3f015b196bafb642deec611cc2b8 SHA-256: 0e1bdbbeb091d97e68c5e3d333d73f52604ae39321cd2c6c8c769ec15708b30b
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is likely intended to lead the user to a phishing or malware distribution site. The PDF also hosts a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt to improve search engine ranking for malicious content. No scripts were extracted, but the presence of embedded links and the ML classifier output strongly indicate malicious intent.

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=kuinka+paljon+canesten+oraalisesti+o
    • http://files.vetwoundlibrary.com/uploads/1/3/1/0/131071240/f3734dec841.pdf
    • http://wawoze.michiganrealtysolutions.com/uploads/1/3/1/8/131856331/1938115.pdf
    • http://files.seafaith.net/uploads/1/3/1/4/131437834/7185734.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6971/0241/files/cisco_catalyst_3650_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52657742202.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/jesig.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7192/files/65853964833.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0582/files/lovisuwef.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4693/files/libajupawixevobilotuzal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4661/files/55878211432.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sigejorivuzogekos.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/afghan_jalebi_video_3gp_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/subetaseropalo.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_off00004e69.bin
9fbae96b7f158a4ab73c7925ed234287ac989f603b3475379b1f3fb279a0152b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E69 5036 bytes
font_01_sfnt_off00005f98.bin
34f17d10409d45926725af0de29671a8d0cc08d65e7f50e50b86b31f2aac79f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F98 13772 bytes