Malicious PDF — malware analysis report

Static analysis result for SHA-256 83db7c4cdd7ad8f0…

MALICIOUS

PDF

53.1 KB Created: 2020-08-03 16:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47777675f670d5d6646a75120ca70ec SHA-1: 4c9a2f9d58f6834a6604587045a18e38be1d2a9a SHA-256: 83db7c4cdd7ad8f02315ecc8ab7382e988bc6fd0f2f5fad050bd79763fff3e97
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=autonomy+in+nursing+pdf
    • http://files.edgerealtyph.com/uploads/1/3/1/0/131070722/zemenofapituz-dagaxexerepusin.pdf
    • http://files.theelectricchairman.com/uploads/1/3/1/1/131164063/61f7a9b.pdf
    • http://files.marencoartrestoration.com/uploads/1/3/2/6/132680784/d74d8380c0c8a70.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/nuxojekafoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3123/files/85914470646.pdf
    • https://cdn.shopify.com/s/files/1/0429/4492/1766/files/nuvar.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/galuve.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/51827366216.pdf
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/vuvuvijomezimopizam.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/32841598726.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/debivujenozuvete.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/96466274240.pdf
    • https://cdn.shopify.com/s/files/1/0435/7973/6223/files/nuzatasurazuvemonuruxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/kofifogi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/21642023154.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/85332214981.pdf
    • https://cdn.shopify.com/s/files/1/0431/0545/2193/files/31775076671.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_off000090b4.bin
5a1033d4a7d0b79d0e9e9760a9824300f2cc2cca8a8f65c385f41303b91972d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x90B4 5212 bytes
font_01_sfnt_off0000a26c.bin
dbc89baebb317e5f46bc324ff8105047ae15ef7a71d3661d82b02aa036bb63b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xA26C 11400 bytes