Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de9deefca97ebb1…

MALICIOUS

PDF

46.7 KB Created: 2020-08-04 15:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07b0aabaf6cd7a11460d13130d51f49a SHA-1: 01219937318072672a53d69535560c74b8da39ac SHA-256: 8de9deefca97ebb1f4b68f65a41f0b727cee5ec96a242190f0068f827f04e941
152 Risk Score

Malware Insights

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

The PDF contains a link farm with 16 external PDF links, one of which, 'https://ttraff.cc/pify?keyword=structure+of+vascular+cambium+pdf', points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains the malicious URL, suggesting it's designed to trick users into clicking through to a potentially harmful site.

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.cc/pify?keyword=structure+of+vascular+cambium+pdf
    • http://files.essenceofbeautydublin.com/uploads/1/3/1/6/131637057/9362341.pdf
    • http://files.skinlosophy.shop/uploads/1/3/1/0/131070849/25cad8cfc.pdf
    • http://files.chunkybrother.com/uploads/1/3/0/8/130874469/4056091.pdf
    • http://files.azdoodleranch.com/uploads/1/3/1/4/131437362/e26111c9bbd.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/44921103691.pdf
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/dekulalenizalafubedozut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakawefefaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/88728274946.pdf
    • https://cdn.shopify.com/s/files/1/0434/7222/4421/files/mosigefezobobefonebulu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8629/9815/files/maine_stocking_report.pdf
    • https://cdn.shopify.com/s/files/1/0438/4499/3181/files/43885065806.pdf
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/kapuzebuzotag.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/5372504142.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/dajobuwegukirezanup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lafiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8986/files/44129841553.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_off00007784.bin
daa5876e0563dd41ae88386e7e46d2dff32e67935c7115bfaf5701f1fdda2bc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7784 5604 bytes
font_01_sfnt_off00008a7f.bin
063b2c4d79f691ecc73e3c3948f80aef8054373ac0fa6f1a676cb22642b4244d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7F 10444 bytes