Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bf036e665669f93…

MALICIOUS

PDF

43.1 KB Created: 2020-08-09 16:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9268962a841a22795cf248d5c651175 SHA-1: 3f67746381b537ef2151b23c493b618aa0a5fb25 SHA-256: 2bf036e665669f93aa621324e750796362beba4cf3e130b7a081c5b2f7ed6818
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that are part of a link farm, with one primary link identified as a malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Buffettology book pdf' and the malicious URL, indicating a lure to download content. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the redirection to known malicious infrastructure.

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.com/pify?keyword=buffettology+book+pdf
    • http://files.jrasales.com/uploads/1/3/2/7/132741169/a418647.pdf
    • http://files.authorcaseybond.com/uploads/1/3/1/4/131453232/sadupusupumatigaw.pdf
    • http://files.kathyshealthyliving.com/uploads/1/3/0/7/130775753/1443139.pdf
    • http://jadox.virginianutritionists.org/uploads/1/3/0/7/130775971/6525986.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/laxot.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6502/files/84344337182.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/18159647681.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/low_oxalate_diet_for_kidney_stones.pdf
    • https://cdn.shopify.com/s/files/1/0431/6508/9949/files/ligefoleni.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/grade_11_analytical_geometry_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/lalorisowifadugizawumiwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2073/7950/files/77408719426.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/norazovapukofumaviluvud.pdf
    • https://cdn.shopify.com/s/files/1/0432/8757/6740/files/autocad_lisp_manual.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_off00006c00.bin
424b4bc2d79fc16b93209f78e57b5aabbd0e4da3af9251cc7c05cfa83e18d67a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C00 5080 bytes
font_01_sfnt_off00007d70.bin
3ef33e4ef909e57b4c5978c7b080f97a4776b288ef8dda0e25b5f514a4647d27
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D70 10076 bytes