Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3addc2b64bc976…

MALICIOUS

PDF

45.5 KB Created: 2020-08-15 01:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cb7500fe6f698ef16826cf4a48b2869 SHA-1: 6ea7d3a9895200359387c32a40af24ff003904c6 SHA-256: 4f3addc2b64bc976978ed5723c5be97edf61a9032e713ec16666e787d5592f25
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=acrobat+pro+dc+enterprise+adobe
    • http://xolofe.tevfikmuratyildirim.com/uploads/1/3/2/6/132681927/be0245a1ea.pdf
    • http://files.idahobluegrassassociation.org/uploads/1/3/0/8/130874050/8422788.pdf
    • http://files.oursaviorsdevilslake.org/uploads/1/3/1/1/131163533/5105704.pdf
    • http://godozewus.armellesix.com/uploads/1/3/1/8/131871597/5494913.pdf
    • http://files.arlingtonmsband.com/uploads/1/3/1/6/131606087/ddee7.pdf
    • https://cdn.shopify.com/s/files/1/0440/5090/7286/files/fasakuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9621/files/jojotivodivuzejedowovuro.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3809/files/arpal_group.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/34055698029.pdf
    • https://cdn.shopify.com/s/files/1/0435/7708/2019/files/tujixipajakulusavikeji.pdf
    • https://cdn.shopify.com/s/files/1/0432/8135/0820/files/casio_fx_991ms_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3246/8890/files/sonibowakosatexoxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/67032248616.pdf
    • https://cdn.shopify.com/s/files/1/0451/7930/6135/files/kindred_jungling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/1929/5131/files/gexadimomiwol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5922/4480/files/fokunig.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_off00006be9.bin
9895594d86307cb12dad087ed71282804d2e2be282ca22bba1ddd8b64c17186e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE9 5164 bytes
font_01_sfnt_off00007d74.bin
3a7db91189c3565c598c5d6198d70df64df50a00df66bded28e9849c4d1e2c38
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D74 13432 bytes