Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb45b7b37c7c1491…

MALICIOUS

PDF

115.0 KB Created: 2020-08-12 19:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18aaac4f64e3b93723039989c5557cad SHA-1: c9a57bd49d542b4ab8e89b3a805b982286a961a7 SHA-256: bb45b7b37c7c1491f64c6237d00ea42f403321e83cda62abca5f58c51621f472
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, indicating a phishing or redirection attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly supports the malicious nature of the file. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, reinforcing the attack vector.

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=principle+of+programming+language+tutorial+point+pdf
    • http://files.frankonfoot.com/uploads/1/3/1/8/131871704/e6adce.pdf
    • http://vetupel.mychristianoccasion.com/uploads/1/3/1/8/131857152/3642af.pdf
    • http://rowubagal.vlsss.com/uploads/1/3/2/3/132303382/zevevuvedofe-varabax-wujakose.pdf
    • http://files.pegasuscharter.org/uploads/1/3/1/4/131438093/vameruzav.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/ielts_speaking_part_2_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/7345/4748/files/lalatabasonupoganuwom.pdf
    • https://cdn.shopify.com/s/files/1/0435/4041/4615/files/1572483740.pdf
    • https://cdn.shopify.com/s/files/1/0436/5674/1022/files/the_prophet_by_kahlil_gibran.pdf
    • https://cdn.shopify.com/s/files/1/0438/1956/5216/files/36929729150.pdf
    • https://cdn.shopify.com/s/files/1/0440/2819/9062/files/biometry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/22872493668.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/sinuxilesatis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9292/files/34711578681.pdf
    • https://cdn.shopify.com/s/files/1/0440/0968/5157/files/gefumenalojifab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d79.bin
082021f12d1338e56ee9f7212431c9ebb9a619fc8169ed4e3c7d99895f7349b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D79 2216 bytes
font_01_sfnt_off00017748.bin
a589cf1d79ef4e9c0488e372879410c15693a759a67b156ba196ebf90300ffe7
pdf-font-stream PDF embedded font (sfnt) at offset 0x17748 5296 bytes
font_02_sfnt_off0001892c.bin
28dd5416ea4ae3005f10ac3c5a8c8f345f18c57d41f7446b2a2b9a7056a0ccca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1892C 17032 bytes