Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9b6919d32dbf15…

MALICIOUS

PDF

65.1 KB Created: 2020-08-01 03:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec44f77c545a271ba2a02d3e37be02e8 SHA-1: 02925eaef0644682e1cd8ebb2b0c5c6a2ae3c8a1 SHA-256: 8c9b6919d32dbf157d7dee21bed2d295f396b381036f0d170847a48c6ba4473e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=object+array+java'. Additionally, it exhibits a PDF link farm behavior, with numerous links to external PDFs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, suggesting the primary intent is to redirect the user to 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=object+array+java
    • http://files.sewmanylinens.com/uploads/1/3/0/7/130739204/5976859.pdf
    • http://files.manakilagigroup.com/uploads/1/3/1/4/131438188/nesixadirusajenipit.pdf
    • http://files.rgsda.org/uploads/1/3/0/8/130813489/53d993.pdf
    • http://files.alexusbomar.com/uploads/1/3/1/4/131483317/7dd03faa70.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/riravev.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/85381505617.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/wokib.pdf
    • https://cdn.shopify.com/s/files/1/0437/6133/6471/files/31413749041.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/juxumadebamapetutorobegew.pdf
    • https://cdn.shopify.com/s/files/1/0434/7641/8713/files/84505044181.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/bufoxonituzu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/8939373794.pdf
    • https://cdn.shopify.com/s/files/1/0436/2013/9170/files/muxiwonedixotajakaniba.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_off0000c2f6.bin
6a58a5a2869bbe92541e51878949280d443f6dc7aa3ffdd7a0ee9916a6bd2547
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F6 4988 bytes
font_01_sfnt_off0000d40d.bin
66b9307a0d488e5efc9c72cb654178baf659ed3ff81bb8cb7cc90ae5a81451df
pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 10400 bytes